This is a loaded question! You know you will need a bed for each sleeping place, clothing storage, a place to eat and chairs to sit in while you eat. You will want some comfortable chairs in the room where you read/watch television. If you are over 50, you will need brighter lighting - see the Houzz Ideabook on this topic.

You probably do not need a love seat. Most of the time only one person sits on one, anyway. If you do not have a guest room in your new house, make sure the sofa bed you put in the living room is comfortable to sleep on. You will have more versatility with comfortable chairs than with a sofa or a love seat. One for each person living in the home. Be sure you have one for the number of people who usually visit at one time.

The rest of this information is available at the free site FlyLady.net (Marla Cilley):
Here are a few tips.
The schedule for working on downsizing:
Set a timer for 15 minutes. Work the following three steps in each room for only fifteen minutes, then move to another room, then the third room. For the fourth 15 minute period of the hour. Sit down, drink water, process the memories that came up. Make lists. At the end of your break, do your other daily tasks such as laundry, dishes, cooking, errands, paying bills, etc. Come back to sorting after a couple of hours. This process will be emotionally draining. Been there. Four times, sometimes my own, and twice clearing my parents' home. Now, about all the "stuff."
What to keep, what to let go:
You will need to make three piles. "Throw away, Give away, Put away". Three paper grocery bags or three laundry baskets, whatever is handy.
Throw Away: Anything that you have been meaning to fix, but haven't is obviously not a priority. Toss it. Any piece of clothing that is stained, torn, or threadbare, goes in the trash. If you could have mended it, you already would have. Toss all your spices. They are usually fresh for only six months to a year. Any photograph in which anyone is not shown in the most flattering light, someone has eyes closed, or you do not know one of the people goes in the trash.
Anything that you look at that brings a twinge of regret, a bittersweet memory, you don't like it but it was a gift from an ancestor: take a photo of it and put the object in the trash. Think, "If I could choose only ONE item to remember this person by, would THIS be it?" If not, out it goes. Go find the happy memory object and put it in the "Put Away" pile right now.

Give Away: Try on all of your clothes (15 minutes' worth). If a piece does not fit, put it in the give away pile. Also in this pile go pots and pans you rarely use, a second set of stainless silverware, odd drinking glasses, mismatched bedding or bedding that doesn't fit any of your current beds, good towels you just don't use (give the old ones to a vet's office or an animal shelter). Also, extra furniture from that fourth or fifth bedroom, the basement, the den, extras from the living room. Go through the holiday decorations. If something is not in good condition, but has a happy memory, take a photo, write a page in your journal, and either throw it away, give it away, or put it away with the holiday things that give you the best memories and a bring a smile to your face. If you have Christmas lights that are not LED, give them away. You will be taking your favorites with you. It is time to bless someone else with your bounty. After you have finished this process, find a young person or young couple who is/are setting up housekeeping for the first time. Let them choose anything from the give away pile. Help transport the item to their home if you have a truck and they don't. After the young people have made their choices, arrange for a charity truck to come and remove the remaining items.

Put away: These are the things you love and use every day. Your favorite table and chairs for meals, your favorite pans and utensils for cooking, your favorite towels and bedding. Your favorite upholstered chair. The "just right" reading lamp. Choose 20 favorite books. Sell the rest at a used bookstore.

If you can get a floor plan of the new house, draw each piece of furniture to the same scale on graph paper. Rearrange items in the rooms. Do you need to move a few actual objects out the door before you move? Much easier to arrange items on paper first. Then you know what will fit. It is also good to make copies and tape one just under the light switch in each room of the new house. Then the movers and helpers will know exactly where that heavy dresser goes and it will be in place on the FIRST try!

This method has worked for me. Please see the FlyLady.net site for specific directions for moving. She calls it a "Moving Control Journal."
Best wishes to you in this transition in your life.

A new Ideabook was added today.
"4 Obstacles to De-cluttering and How to Beat them"

Wow! You rock. This is incredibly helpful. I have helped others with this process but doing it for myself is definitely harder and I have gotten too wrapped up in the memories. Thank you!!!

Yes, one's memories can be overwhelming if this task is not done in small segments with a couple of hours in between. Expect you might have a dream in which your subconscious lets you know what IT thinks. Write the dream (or dream fragments) in a journal as soon as you remember them. Ask, "What comes to mind when I think of (something from dream)"? Jot down the first thing that pops into your mind. You might surprise yourself with insight and understanding!