It is hard to advise without photo's of your room. I don't think there is a guide (pro-designers may know) I think it Is more of whatever fits in your space and looks good in your space.

pics of furniture, pics of room. please.

Generally, furniture should be arranged for ease of conversation or oriented towards a focal point such as a fireplace or nice view. With regards to how much furniture to use in a space, a major factor to consider is the relationship between the size of the room and scale of furnishings placed in it - both visually and literally.

But, yes, do post photos of your room and you'll get some great feedback.

Less is more. Most people overdue with large, poufy furniture. So, you might be suffering from that issue. Americans don't typically sit close to each other so long large sofas are a waste. They also aren't flexible so if you move, you are stuck with furniture that doesn't work. Generally speaking, unless you are really tall, stick with 84" long sofas, 36-40" deep. Swivel comfortable side chairs, and interesting coffee tables and end tables. Very general statements. However, almost no room is "typical"! So, pictures and we can help more. Room measurements are a must to help you deal with arrangements.