A 45-105 set is going to be the easiest to lay your hands on. Stainless tends to be a little brighter than nickel, so go with what you think your preference will be. YouTube is tough to use as a means of auditioning before you buy. People try, but it just doesn’t translate that well. Don’t fool with tape wounds or the like for now. Flats may be something you might want at some point, but probably not now. Getting a set of stings that don’t necessarily agree with you isn’t a death sentence. It just gives you the opportunity to try something new next time around.