1. About mid-range. Not as busy as holiday weeks, but fairly busy. As this is your first trip, it will probably seem quite busy to you.
2. Variable at that time of year. You might get afternoon 80's, or it might be more like upper 60's and windy. November tends to be a bit breezy. If you search weather trends for zip 32830, you'll see factual weather averages. Some days will probably be okay for swimming, but it might be a bit chilly to swim other days. Good idea to pack at least some long pants/hoodies or jackets, and probably plan to wear them at night. Also good to recheck weather the day before you leave.
3. For me, yes. Unless you plan some non-WDW days. Going to Universal breaks it up a bit, but even better is a few non-theme park days. For me, after 7 days the crowds, queues, and incessant Disney music start to annoy me. It is fun for a week though.
4. I'd suggest 5-7 park days. Even 5 is not enough to see everything, especially on your first visit. But it also depends on you, and how much you enjoy being that type of environment.
5. I am not sure plus size matters in footwear. EVERYONE should invest in good quality, comfortable shoes. Even though we plan to walk around WDW, we tend to buy running shoes at a running store. A big reason we go there is that they asses the way each customer walks, and suggest shoes to correct for any pronation, flat feet, high arches, etc. If you can't do that, Brooks is one of the better brands. The running store helps everyone buy sneakers, you don't have to be a runner. If you are prone to any problems/variations the correct shoes can make a big difference in how your feet feel.
We always bring 2 pairs of shoes, where at least one of the pairs is water tolerant. We often wear quality sandals; the kind with adjustable straps and arch support. Ecco is one brand, but far from the only good one. Teva is another good brand. If you can't find water-proof shoes, you can also buy waterproofing spray. It won't make sneakers waterproof, but it will help many shoes to be more durable in rain. If you like, you can also bring cheap flip flops for the shower/pool. Alternating shoes every other day helps at WDW.
[I mentioned adjustable- EVERYONE's feet swell when they spend all day walking. Being able to adjust your footwear is another important feature of good WDW footwear.
If you are prone to blisters, then there are a number of helpful products to prevent them. One inexpensive option is precut strips of something called moleskin. (Dr. Scholls brand moleskin is one option.)
Orthotics (via a podiatrist) are maybe another option if you want to improve comfort, but they can be $$$.
I also always tell everyone who asks about footwear to try to get outdoors for 30-minute daily walks starting at least a month before your visit, but if you can start sooner that is even better. Walking more than 30min is also better, but it isn't always easy to take 60min walks. WDW is a lot of walking. Even finding little ways to incorporate a little extra walking into one's daily routine is good, like taking the stairs instead of elevator.
The key is endurance. The greater your endurance, the more you'll be able to see at WDW. If walking for 6+ hours is too much for anyone in your party, consider having that person use a mobility device at WDW. They are very common at WDW: could be a stroller, wheelchair, electric
scooter, etc. (though WDW does have rules on which they will allow.)
