hey, i've been playing guitar for about 1½ years and thinking of buying a bass. I know it sounds stupid, but just to make sure I can't run it through my amp( Spider III 15 w, btw).. So ..Can I run it through my guitar amp? or will i need a starter kit?
you're amp will sound like crap and will blow up, which for you might be an upgrade, so go for it
Fender American Standard Telecaster
Martin DC-16RE Premium

Fender Snakeskin Champ 12
Playing a bass through a guitar amp will hurt the speaker.

Its perfectly ok to do the opposite though.
If you cant afford a bass amp use the amp but only use the clean tones and plug your headphones in so it doesn't break your speaker.