Congrats and welcome to the hobby
1. The rubbrmaid should be ok, How much bigger than the T is it?
2. I'm not too sure what that bedding is but I would just use regular peat moss or potting soil. As long as it's chemical free.
3. I feed mine one cricket a week. I buy a bunch at once, and use a smaller gladware container to keep them in.
I think you have everything covered.
Oh yeh in the future you may need more tarantulas
I'll warn you now, this hobby is very addicting