This is what I'd recommend you:
Study for GMAT. While you study, visit this forum and check out the numerous postings on applications and such. You'll gain much more information by browsing through it and learning. But here's a simple breakdown of what you should expect:
Each b-school will ask you for the following information:
A set of essays that you have to write
Letters of recommendation (2, or sometimes 3 letters)
Extracurricular activities that you have participated in or are participating in
College grades (or transcript)
And various other minor materials, such as demographics and personal information
The application calendar year typically goes from October to May.
Each school is typically divided into 3 different rounds, with the first round's deadline in October, second round's deadline in January, and third round's deadline in March. You have to turn in your complete application by the deadline to be considered for that specific round. You will typically hear back your result before the next round is due. You can only turn in one application per school per application year. You also typically want to have your GMAT score already before you commit to a specific round.
In terms of which schools to apply for, it depends on what your post-MBA goal is, where you'd lie to work, whether you need sponsorship, whether you'll require financial assistance or scholarship (some internationals, due to financing issue, will only go for schools that will give scholarships), and of course, your unknown GMAT score. Therefore, it's probably easier for you to just focus on your GMAT right now. If you get 700+, there's a certain tier of school you should focus on. If you're in the mid-600's, there's another tier.
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