Hi Sam and welcome to the 'Edge'...
Costs....well where do you begin, bike I suppose... £1000 for a reasonable 125 to start with... kit including helmet and boots for approx £275 but you could buy s/hand (but not helmet) fuel to and from meetings assuming you already have a van or trailer to get it there, fuel for bike approx 2 gallons for a meeting plus 2 stroke mix.
Be a good idea to start out by just going to local practice tracks at approx £30 for the day and if you can find someone to help out with advice on how to ride correctly that would help a lot... after you have a bit of experience then get out and race.... Entry fee approx £40 plus either a day licence about a fiver (yearly licence works out much cheaper)
Hope this helps and im sure other members will post up help as well..
