I am too tired to look for the link.
I think that the player and his family need to look at last year's bonus' (first 10 rounds is available on PGcrosschecker and Baseball America, might be for a cost). A player needs to decide what it would take in $$ to go pro. The amount you see in signing bonus does not reflect federal taxes, state taxes, medicare and social security, or agency fees if they sign with an agent who has been advising the player before the draft. All teams are required by the IRS to take 25% (unless the bonus is under a certain amount) off the top. Any adjustments are made when one files taxes.
Do understand that whatever a player earns in season is usually gone by the end of season. Even though his room was free, mine ate most of his salary. For son, eating well is very important. If you need to cover car payments, insurance, cell phone bill, etc. with that money, it won't work unless you want to eat at McDonald's everyday. If you have gotten some decent money for signing, I feel it is important to put as much as you can away into savings and learn to live on a budget, perhaps a players parents are still willing to help if necessary. Many players work in the off season to help supplement their needs so they do not spend their signing bonus. I would imagine having some college experience or a degree, can make you more money than just out of HS.
I am not sure whatinfo you are looking for to pass on.
IMO, it's a personal preference. Just as important as getting a $$ bonus, the player needs to understand the system and how many years one may be in that system making the same salary.
Give me a shout if you have any questions.