ricmac,
I am also in the Boston area. Two problems I have found in lawn care 1) no one will give you a straight answer (locally),the dopes in the big box store don't have a clue,the reps for the fertilizer cos.tell you something that's going to get you on their hook and the pros all have their secrets that reminds me of the magicians society, these are people I know.
2)this board has people with from all over on it, not familiar with our unique conditions or problems.As you well know things are different in CT & RI as compared to So. NH and So. ME not to far away but yet different.I've been on this board for a few hours looking for some answers to a few lawn problems of my own.
I would get going today, the weather conditions are ideal for seeding. As far as the weeds are concerned they won't have much of a chance if you have a lawn established. Buy a decent seed and some starter fertilizer and get going.Worry about the weed problems later a good lawn takes time and a lot of questioning. And by the way your pix didn't show up

Plant your grass. Fertilize. Use a roller to ensure optimum soil contact. Mulch with clean straw. Water if you can and hope for the best. After a couple or three cuttings, use liquid broadleaf herbicide on the weeds. Plan to overseed bare or thin areas in the fall.
Bill Hill

Take and seed the area use a started fertilizer and try to cover the seed with some sort of mulch or weed free compost. Wait at least four weeks before mowing it when you mow it start at the highest setting on the lawn mower till you get it to the hight that you want it to be. After you have mowed it four times then you can hit it with a granular weed and feed or a spray try to use a concentrated formula like Trimecplus this will control the broad leaf and grassy weeds as well.

Here is a link that might be useful: do_it_your_self_web_site

Some things are common around the world. Seeding in the spring is a mistake. The dreaded crabgrass seed is everywhere and if you care for any grass seed in the spring, the crabgrass seed will take advantage of the perfect conditions to sprout. This is not a serious problem unless you allergic to crabgrass. You have bare spots which are going to sprout something anyway.

You could cover the bare soil with mulch until the fall. You are going to have to seed in the fall no matter whether you seed now or not. Mulch automatically prepares the underlying soil for planting.

For tap rooted weeds like dandelions, you can use a tool called a Weed Hound. It makes plucking weeds out very easy.

Oh and I could not see any pictures.

Ok...Hopefully the pictures will come through this time. The first two are the areas that remain uncleared. In a month the brush & weeds will be thriving. The last three are the areas that have been cleared. I'd like those areas to thrive as well...just not with weeds! Those of you who have suggested mulching, exactly what type of mulch should be used?

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I think its worth it to seed, get enough siduron/tupersan for two applications (it only last 4 weeks). If you have irrigation you should be OK through the summer. Scott starter for seeding has tupersan in it, so if you get enough of it for two applications you should be OK (and a second dose of starter after 4 weeks isn't a bad thing). After that you can decide if you want to put down halts (dimension 8 weeks from now would carry you into august which is when you should probably plan on re-seeding, possibly with a slit seeder or power rake).

As you are in New England the fall seeding season can be pretty short (all depends on what kind of October we have). If you are planting bluegrass you'll need a lot of patience.

Bill Hill, +1. He is exactly right.

Plant the seed. Most of it will grow.

Kill the weeds, with Weed B Gone. Most of them will die.

Evaluate where we are in September/October.

Would you rather have a problem, or have 1/8th of a problem? In September/October, you will have 1/8th of a problem. We will deal with that, at that time.

Perhaps even the same way.