Buy your ticket for the School Lottery

We have set up a school lottery.
Tickets cost £1 per week – (minimum 4 week sign up.)  Someone from our school lottery will win from our pot every week.  The more tickets sold the bigger the prize.
40p in every pound goes to our school.
The first draw is Saturday 4th April. 
There is also a chance of £25,000 in a from the local pot every week too?