Advice for a non-traditional / career-changer

Hi,

I graduated from UCLA four years ago in Art History with a ~ 2.8 cumulative. The only related course I took in undergrad was at a CC prior to transferring (Stats for Behavioral Science - Grade A). Since graduating I've worked part-time as a freelance copywriter for tech companies such as Microsoft, NetApp, and others.

Somewhere along the line I became very interested in and started to self-study investing, and my long-term goal now is to work at a value-oriented firm. Given my background and goal, should I:

1. Focus on taking some prep courses at a local college or university and/or attend a post-bacc or pre-mba program, then apply to an MBA?

2. Focus on continuing to learn as much as I can about investing, studying for the GMAT, and finding a full-time role somewhere in my current field?

3. Both? Other suggestions?

Thanks a bunch. I'm not that familiar with the world of MBA admissions, and it seems like investment roles can be arrived at through different paths. Any input you have would be greatly appreciated!