1) a very large bowl if you want all those fish. I flat out don't recommend fish at all in a bowl that's less than 2.5 gallons, and only a betta or heterandria formosa at that. No danios at all, and stick to only one species of fish, if that. Shrimp are your best option, and would handle the close quarters the best.
2) Substrate seems to be Aquasoil (powdertype?), with a co2 diffuser in the back behind the plants. Also using a fairly strong light, personally I'd go with a desk lamp with a 6700k bulb. Desk lamps get you plenty of light with many different styles and looks for a reasonable price. I got my favorite one for $1 at a thrift store, and added $1 of paint. Good as new.
3) Plants...hard to tell. I think it's:
(from back) Jungle Val, Rotala (?), Moss of some sort, Anubias nana petite, water wisteria (?), unknown red plant, Buce of some sort, and dwarf hairgrass in front.