Here's what I would suggest. First, be happy - you are waaaaaaaaaaaaaaaaaaaaaaaaaaay ahead of the game on this.
1. Contact local alumni at your target schools. The school can help you set this up. This will let you begin to develop a feel for the school. Keep in touch with whoever you get put in touch with - try and talk over the phone, or better yet, meet the person for coffee.
2. Schedule a campus visit to the ones you are truly interested in and attend any info sessions there are in your local town. In fact, attend two.
3. Research Research Research. All of your schools - get to know them well. (1 and 2 are key elements of this). You should get to the point where you can talk about a school as if you are a student. When someone asks you about Cornell for instance, you should be albe to say "Oh man, well sage hall is really nice, and the practicums they have are pretty cool - this year they had one with siemens... etc etc etc". Find out about school clubs and make a list of ones that interest you. Once you know the details of your school to this extent, writing the "why X" will be easy.
4. Draft the answer to these questions:
Why do you want an MBA?
What do you want to do, both immediately after your MBA and 5-10 years later?
Why does this school interest you?
Keep in mind school specific word limits. Do this for each school, but do it only after (or in parallel) you have done 1-3.
5. If you are involved in any extracurricular activities, reach out to the president of that group and ask for greater involvement. You'd be surprised what kind of impressive roles you can get just by asking for them. (But dont go join something new this year unless you have nothing - or else itll be pretty transparent)
6. I wouldnt do your recs now. It's too early - by the time you get to fall, you may have a new manager, you may have done some new great things, and of course, the questions they ask may have changed as well. I'd say, the minute you can sign in and get them the questions, do it. Like, the DAY OF. Give them a heads up now, but don't start drafting yet. Instead, start taking note of impressive things you deliver over the next 7 or 8 months. Make a list of key leadership activities at work, outside work, etc.
7. Research your target industry - just a ilttle bit - but enough to have at least a passing conversational understanding of the industry. .
8. Get transcripts.
9. Rework your resume. Again and again.
10. Make a list of all your extraccuricular activities, hours and dates for each. You may even need contact information for these, especially those post-college.
11. Rejoice! You are waaay ahead of the curve, and it will pay off HUGE.