pelotasalivar -
This is information should be provided to you by your son's recruiting coordinator or financial aid office the summer before school starts. We've found in talking with other baseball parents that the time-line seems to varied by school and the process differs greatly by the type of scholarship you received. But your son's college should give you all these details once his NLI's is signed ... if not, go ahead and ask them for a financial time-line.
Example: At son's school the baseball scholarship funds for tuition are paid direct, no actual deposits are made, and it happens right before registration day. All other funds are either paid direct or put into the students account (depending on whether the scholarship covers 100% or not) on the first day of class. Any deposits required earlier (for housing, dining plan, etc.) are waived for a player who had these items specifically covered in their package. Others are required to pay the $'s up-front, before the scholarship funds are posted. All this stuff really depends on the school's procedures. Hope this helps!