It's kinda weird a major in tennis, but I'll try to help.
Here in Brazil, tennis is not a popular sport either. And before Guga it was even worst, since we couldn't even have access to the top materials (racquets, shoes...) anywhere in the country.
We have a budget for the young tennis players. The top 5 of each age receives a certain ammount of money, which is enough to buy equipment, travel and subscribe in all the national tourneys, at least. The problem is that this money is not used very well. Some young players use it to buy lots of crap just to show for the other players.
Anyway, we have the site www.cbtenis.com.br
, which is from the Brazilian confederation. I don't know if it will help, but I hope so.
If you need any specific stuff, please let me know, and I'll do some research around.
Hope you are successful in your paper! :P
Edit: The ammount of money is for the players from the state where I live (Bahia, which is the home of Brazil Open). I don't knowhow it works at other states.