The Application Process

Dear All,
I gave gmat last week and ended up getting 650.my gpa is 3.regarding my work ex- worked for 1.5 years while studying and 6 months thereafter.i am an indian by ethnicity, i completed my bachelors in engineering from mumbai university in june 2010.
i am currently on an L2 visa(dependent for an L1A visa holder,MY Husband) residing in florida.i've not been working since jan 2011,as i got married and moved to different countries adjusting to my husband's job transfers.

could club mentors,members,guests please brief me how to go further from this point. i have a few questions
1.which is the earliest semester i can apply for?
2.do all schools have fall and spring semesters?
3. will i be considered as an international student or out of state student and what are the deadline for the application for each category?
4.which are the universities i can apply with my score?
5.should i consider retaking the gmat to better my score?(as 650 is the lowest i've got in my mock tests.range-640-740 in some 25 tests)
6.how helpful is having a green-card ,as we are expecting to get it in a few months( 6-8 months)?

eagerly awaiting for your reply.I'll be obliged.
thanks in advance.

Some MBA programs have a January intake, such as Columbia, INSEAD, Thunderbird, Ivey, IMD.

thank u so much for the replies!!!!!!!!!!!!