I'd recommend getting a hotswap keyboard! That means that you don't need to solder switches onto the PCB, instead you can just pop them in and out of a socket. That way you can easily try out switches, and since there's more switch diversity now than there's ever been, it's really fun. You could check out the CTRL and ALT keyboards here on Drop, or put together an inexpensive 60% keyboard yourself using parts from KBDFans. The hardest part will probably be finding a PCB that's in stock, but eventually you will -- I got mine from 1upkeyboards. There's also the Glorious GMMK keyboard.
If you're looking for a great prebuilt keyboard, check out trusted brands like Leopold (my fav), Varmilo, or Ducky. Those require the least work, but you'll constrained to stock Cherry switches, which are in many ways inferior to the huge variety of other options out there. If you like tactile switches, check out Halo switches, Zealios, or Gaterons.