If you're trying to do something "relevant" or in the job market... Common Lisp seems to be the better route. If you're just exploring and having fun... Scheme is awesome. If you really want to explore.... you can try building your own Scheme and your own Scheme standard library, etc. Either way, make sure you're having fun.

For learning "the way" http://kysmykseka.net/koti/wizardry/Programming/Lisp/Scheme/The%20Little%20Schemer%204th%20Ed.pdf

For learning some practical bits http://www.gigamonkeys.com/book/

Outside of books, you need to dedicate yourself to some achievable projects that you find fun and interesting. Like a guessing game. Or a MUD. Or a blog. If you don't have the drive to learn...you wont learn. Interesting projects usually create drive. If they don't, the project isn't interesting enough or you really just don't care. Think small. Work your way up.

LISP languages are beautiful. It is one of the most elegant programming philosophies there are. Code as data...data as code. Limitless.

It's not the easiest realm to understand. It's not the most practical (in a sense) if you are building a team where you want a large pool of candidates. It might not even be the perfect answer for your specific problem domain. But, compared to other philosophies of programming languages... it takes the cake (in my mind).

Simple. Powerful. Amazing. Breath taking.

Derp.