Oh, also, I couldn't decide whether to put this in the General or Design forums. If any mods/admins want to move this, please do so!

I think the Design section is the right one.
As for the typeface...
http://www.impallari.com/projects/overview/matt-mcinerneys-raleway-family
http://www.fontsquirrel.com/fonts/montserrat
https://www.theleagueofmoveabletype.com/league-spartan

If you still think a geometric sans is your preferred way to dip in type design, you could want to look here first: http://typographica.org/on-typography/making-geometric-type-work/

League Spartan looks great! I still might design my own though; it seems like it would be fun.

Thanks for the suggestions!

I didn't start with a geometric typeface and I feel that was a good choice. A lot of people seem to start with a geometric typeface, thinking it's easier. It may well be, but most of them produce very bad typefaces. It's probably to be expected from your first design, but if your first project is probably going to produce questionable results I think it's much better to learn as much from the project as you can, rather than trying to produce a typeface to be used. I certainly haven't been able to use my first projects, though I spent more than 120 hours on my first design.

My first design was a serif typeface, and I honestly feel I learned a lot more from it than I would have from a geometric sans. So if designing a geometric typeface seems like fun, go for it. If you're using this first project to learn how to design typefaces, you might want to consider something more advanced. You will probably fail like I did, but learn a lot from it.

Also, here are some articles I wrote on type design: http://temple-of-typefaces.deviantart.com/blog/?offset=1
The post 'type resources' features a lot of good stuff, and the tutorials I made on type design might help you as well.

Thanks Martin for the recommendations!

Do you want
a) learn type or
b) become known as a type designer?

I cannot honestly recommend aiming at both the same time.

Coming out with a “geometric” face as a newbie is very likely to become your safe ticket into failure.

If your typeface is going to have heavier weights available, doing a low-contrast sans is harder than doing a medium-contrast sans.