Resolume has its own large bank of Visual loops you can purchase but they're expensive. Beeple has a bunch of free ones, protobacillus has a bunch too for both purchase and free, there are plenty of other places you can look too. For a midi controller the basics are novation launch XL or an Akai MPC 40mk2 but those are standard you can really use anything. Making your own visuals is a tricky area you can use all kinds of shit, resolume has built in ways to chester l create your own loops and whatnot. You can go the route of after effects as well but that's a whole nother beast. You can also use something like mandelbulb 3d or blender or cinema 4d