Here are my 2 cents:

1. Chances are you will get very little financial assistance even if you do very well in GMAT and GPA is 4.0.  Most B-Schools do not provide grants.  You are expected to take loans, since the ROI usually is less than 5 years (assuming you go to Top 10 schools).

2. Unlike GRE, you will be expected to do very well in Verbal section of GMAT as well.  English as 2nd language usually does not cut it because when you are managing a company, you are expected to communicate well.  You cannot communicate well with poor English.

3. There are numerour online groups.  Join them.  Benefit from them.