Do not restrict yourself by size. I was also intimidated by the size of the class A motor homes, but now that I have been driving one, it is no big deal. Going full time, you will probably want more space.
If you are going to move around a lot, you will want a motorized RV. If you plan to stay in one place for long periods of time, you will want a fifth wheel.
If you have a motorized RV, you MUST have a toad. You are living in it and you cannot take it some places you want to go and you do not want to unhook everything every time you need to go shopping.
A Famcamp is an RV park on a military facility. The prices are good for nightly stays but long term stays are often much more expensive that RV parks since many do not offer discounts for longer stays.
If you go with a diesel class A, budget about $2000 per year for maintenance. You also need to carefully look at the state you will have as your residence. The costs of registering the RV varies greatly by state.
There is a full time forum. I would go there and search for threads that talk about the cost of full timing. There is a lot of good information there.
We are both retired military but are not full time but we have a lot of experience traveling with the RV. Getting health care using Tricare should not be an issue for you. You will need to know what facilities are Tricare authorized where you are staying.
