One path you could take is to start using a lisp for the platform you're already familiar with. There is Hy for Python, LispyScript (and others) for JavaScript, LFE for Erlang and more. These are "lisps" to varying degrees - they all are written with sexps, but they typically preserve the semantics of underlying language, which makes it really easy to pick up and get over the initial hurdle of "ZOMG parens!!!".
I had good experience with Chicken Scheme, which is both much simpler system than Racket, but also quite rich in features and add-on packages and it also produces fast native executables. I suppose you could make it your first Scheme.
Of course, Emacs users should just hack in Elisp for a couple of months, then switch to Common Lisp. I wouldn't recommend going straight for CL, unless you're going to follow some really good book (like pg's "On Lisp" or maybe "Land of Lisp"), because it's very easy to drown in CL capabilities.
You should decide what you want to build - don't learn a lisp just for the sake of learning, build something with it! - and then choose the best lisp for this particular project. I'm sure lispers everywhere will be happy to help you choose (just before the thread evolves into massive flame-war, again... ;)).
I had good experience with Chicken Scheme, which is both much simpler system than Racket, but also quite rich in features and add-on packages and it also produces fast native executables. I suppose you could make it your first Scheme.
Of course, Emacs users should just hack in Elisp for a couple of months, then switch to Common Lisp. I wouldn't recommend going straight for CL, unless you're going to follow some really good book (like pg's "On Lisp" or maybe "Land of Lisp"), because it's very easy to drown in CL capabilities.
You should decide what you want to build - don't learn a lisp just for the sake of learning, build something with it! - and then choose the best lisp for this particular project. I'm sure lispers everywhere will be happy to help you choose (just before the thread evolves into massive flame-war, again... ;)).