Filter or choose which universities you are gonna apply (1 month approximately)

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Take the tests GRE & TOEFL (2 -3 months approximately)

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Write the SOP,Request for Letters of Recommendation (1 month approximately)

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Fill all the applcations and send all the Materials (1 week approx)

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After receiving admissions choose one of the universites & reject others (depends on your senses)

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Pay SEVIS FEE @ www.fmjfee.com (For ppl who applied in USA)

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Apply for visa

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Book flight Ticket as soon as you have received your visa (1 day)

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Take flight and land at your dream place

Its better to check the official GRE page at ETS.
Here are the cost accoring to that page on 23-august-08. The fees are subjected to change any time. So be careful.Also you can give the exam only once in a month and 5 fives in a calendar year. Also all INDIANS must need an passport for attending the exam. So don't register for GRE unless you have a passport. I faced huge problem with this. I actually received my passport  on the day before the exam.

$140	General Test—U.S., U.S. Territories, and Puerto Rico
$195	General Test—China (including Hong Kong), Korea, and Taiwan. See Bulletin Supplement (PDF).
$170	General Test—All Other Locations
$ 25	Late Registration Fee
$ 50	Standby Testing (paper-based test only)
$ 50	Rescheduling Fee
$ 50	Changing Your Test Center
$ 12	Scores by phone
$ 20	Additional score report (ASR) requests–per recipient
$ 50	Question-and-Answer Review Service—Verbal & Quantitative Sections
$ 55	Score Review for Analytical Writing Measure
$ 30	Paper-Based Test Hand Scoring
$ 30	Score Reinstatement Fee