Betting with points

[leeandrew]

What sort of statements or codes should i be looking at to do the following:

 

When my users sign up they are given 10 points.

 

I want them to be able to use the points on various football teams which are rated by all the users.

 

i.e. a user bets 5 points on Liverpool F.C.- a week later Liverpool F.C. have risen up in the ratings league so the users points are altered accordingly... like if the rating has risen by 10 points from 70 to 80 in a week then the users points increases 20%. And equally if the team has dropped in rating the points of user decrease by a percentage.

 

Can anyone suggest somewhere i can start?

 

Thanks