A good quality potting soil will be fine. Don't use LillyMiller powder fert as there is no bacteria added to it. Only Whitney Farms or Dr. Earth.
Why would you think you're in over your head? It's not hard.
Pretty much any NPK that is for flowering. Dr. Earth has many different ferts but the one that is something like 4-8-3 should work. So will 5-5-5.