As a newbie to MMM, I have two suggestions. First, decide to jump in head first. Don't try and ease your way into the water, best to jump in and adjust all at once. Otherwise you prolong the pain and it is hard to keep the momentum.
Second, set aside 30 minutes a day and read through the blog archives. Doesn't matter forward or backward, just work your way through the MMM blog entries and get a feel for how this philosophy works. A lot of the answer to your questions will become obvious once you get an understanding of how it works. Not that you won't need to ask questions here, but it will make more sense overall.
Make sure to read this:
http://www.mrmoneymustache.com/2012/04/18/news-flash-your-debt-is-an-emergency/I agree with the others, contribute to retirement fund to get that match, and just put it in the cheapest index fund they offer. By cheapest I'm referring to the expense of the fund, hopefully they will have a full index fund around .02 or .04% expense. You can figure out whether to add bonds or diversification later, just get it started in a cheap index fund to begin with.
If you want help with your overall expenses just list your monthly expenses and we can offer suggestions and help you make a plan to get your ship headed the right direction. You aren't in terrible shape, you have a full life to figure it out and get back on the track you want to be on. But the faster you find that track and get thing headed the right direction the better off you will be and the better you will feel about your life.