Hi jsshoesmith,
Many MBA Programs expect applicants to have 2-3 years of quality Work Experience - so if you want to apply to School without that experience, then you might be making it more difficult on yourself to receive an invite (and by extension, you might be limiting your options). As such, I suggest that you do a bit of research into the Schools/Programs that interest you and gather the necessary information about what you'll need for a strong overall application. It might be that you'll want to push back your application plans (especially if what you're planning doesn't match-up with what your 'first choice' School is looking for).
All of that having been said, many Test Takers spend 3 months (or more) of consistent study time before they hit their 'peak' GMAT scores, so you probably won't need 300 days of study to hit your peak score (although it's nice that you have that extra time if needed). Starting your studies early - so that you can 'lock up' a competitive GMAT score for later use - is a good idea, so if you can commit to a consistent study routine now, then you should consider it.
Since it sounds like you're just beginning your studies, then it would be a good idea to take a FULL-LENGTH practice CAT Test; you can download 2 for free from
www.mba.com (and they come with some additional practice materials). If you want to do a little studying first, so that you can familiarize yourself with the basic content and question types, then that's okay - but you shouldn't wait too long to take that initial CAT. That score will give us a good sense of your natural strengths and weaknesses and will help provide a basis for comparison as you continue to study. A FULL CAT takes about 4 hours to complete, so make sure that you've set aside enough time to take it in one sitting. Once you have those scores, you should report back here and we can come up with a study plan.
GMAT assassins aren't born, they're made,
Rich