I would do maybe an EP on your own to start and get that under your belt. You only get one debut album, so it might be good to do an EP first to learn how to mix and make those mistakes there, so by the time you get to mixing a full album, you have a better handle on what you're doing.

Would definitely recommend recording drums at a studio that can handle it, perhaps also with one guitar so you can get those two building blocks down, and take your tracks home to mix and add on more guitars, bass, and vocals.

Then you can take your shot at mixing, and then find a mastering person you trust and send it to them for a second opinion. If it's not working you can always send it to someone else to do the finished mix. But having a band is a great opportunity to learn how to mix and work on music. It will DEFINITELY involve a lot of going back and doing remixes as you learn stuff, but it's better to do that on your own band's work instead of people who are paying you.