My advice is to take it slow and start simple. Don't go for the full blown RGB, crystal chamber, etc. right off the bat.
Nano Biscotte is a fantastic board, and easy to work with. It will give you the ability to load your own sound fonts, and gives you pretty decent blade effects and FOC. It's also very small and will fit in anything.
Pico crumble is a new board that's out. It's tiny, with no swappable fonts. But it has RBG support with 6 built in color profiles and also does FOC.
Sabercore 2.0 is another great starter board. It's bigger than the NBv3 or crumble, but it fits in just about everything too. No swappable fonts, no FOC, but it will drive a SF X4 LED at full power. It has big pads to solder onto and is a very straightforward install.
Once you pick a hilt you want to build, visualize what you want the blade to look like and what you would like it to do. That will help drive your choice of a soundcard. I'd stay with the three I listed for your first couple of builds before tackling something harder like a Spark2 or Prizm.