1056 ive used in my blonde when fermented at lower temp 65-68 has come out great. Since this is your first attempt dont stress yourself out too much. Get the wyeast no need to make a starter since your doing 2.5 gallons the smack pack at 100 bill cells should allow this to ferment cleanly.
As for your equipment list I dont see any type of bag for BIAB or a carboy, or a 6 pack of home brew to drink? From what you have all you would really need is your 6 gal pot, Digital thermometer, ss steel stirring spoons, colander, one extra pot if your going to us it for sparging but not recommended.
Ive done b BIAB and each time I changed the way I was doing it. I would recommended that you have the volume of water to grain ratio lined out and calculate how much for boil off so you hit your 2.5 gallons. If you dont hit your 2.5 gallons keep some extra water aside and use it as top off. If your worried about sanitation by using top off water boil 2 gallons for 20 mins then add what you need before you chill it. Lastly dont be discourage if you dont hit your OG, it will still be beer!