Hey, get one with a headphone jack. If you don't, you'll wish you had, eventually. My little Bassman 25 has the best tone in headphones of anything I can think of lately---naw, that ain't right, that V4 with the 810s was nice last night---what I mean is, you're gonna want a practice amp anyway, even if you get a giging amp. But, no need to blow lots of dough to get started, and with a great-sounding amp for not much, really. Here's what I have:
Fender Bassman 25-- it can do a small, small gig, if needed. Easy to carry anywhere anytime. Not good for regular band practice, playing full-force rock, nope. For you, get something for gigging when the need comes, or just for fun anyway, if you have the dough, what the...
Markbass CMD 121H combo-- 300w, one 12" speaker. Covers the basic clubs, etc. for gigs, if it's not over loud, which fits my gigs (well, not always, it would be nice to have another cab). Anyway, it's for gigging.
At home, I leave one bass set up, headphones rigged up along the strap, with it plugged into the Bassman 25. I go in there all the time just for a little session (right next to the kitchen, too). Maybe five minutes, maybe an hour. It's not like study, but more like fun, but serious fun. And it's a place of peace for me because when I'm there, in my world of music, there is nothing wrong. Everything is good. So, about the headphones, I must have them so I can be private and not have to worrk about bothering anyone, plus it CAN be loud, heh, heh.
When it comes to gigging, I found that for me, I needed at least 200w. My Trace Elloit 7215 SM (one 15") satisfies that. But my Markbass does just as well with a lot less weight to move around.
Have you looked at the value packages you can get from Squier? Heck, you can get a bass AND an amp for $200 and have something that'll get you going, and sound pretty good, too. (I'm not sure if the amp has a phones jack or not, I think so). No need to get the most expensive equipment you can find to learn on. Just make sure there isn't any issues with the stuff. Maybe you'll wanna get the bass set up better. Squier is ok.
Have fun, pal.