Forum with database

i want a forum where members pay £5.00 a month membership fee,as i will be having competions on my site horseracing competions real ones NOT FANTASY.i need a lot of contact with the person doing this by phone and e.mail this competion will be run on points.i.e every evening i will put in all the days and night racing members will pick their 3 only selections and confirm .end of the day/night i will put in the results and the database will give every one who selected the winner/s 10points.james