Either way you're fine for starting off. A good 75% of my noodling/practicing is done on my electric, with no amp or anything....And lately, I've been picking up my acoustic a lot more again, because it really gets your fingers and technique in shape. You can't hide or fake anything on an acoustic. No massive distortion to give you endless sustain, no chorus or reverb to hide shoddy tone & no delay with infinite repeats to hide ganked or missed notes.

Besides, you really are forced a bit more to think about your playing/song writing with an acoustic since it's so bare bones compared to blasting through a 1/2 stack or with the processed tone of an effects unit. There's no harm in putting in you time on an acoustic, until the right electric comes along. Heck I only paid about $95 for mine and even though the cheap bridge pickup crapped out right away, I still more than got my $'s worth out of it.

Best of luck,

Don