When it comes to moving from your regular voice to falsetto and then back again, can you learn to get better at this? I can do it but not with any great deal of confidence.

This can be really difficult, just make sure that you're getting enough breath, popping into falsetto with intention. Practice makes perfect! Good posture helps. Pro Tip: You always sound better in the shower.

Really glad our short convo got you inspired man! Good luck with finding the backing tracks you want... Also don't think you should give up on the keys completely... I think @steevc might be right about the bad karaoke thing :P Either way, all the best!