Either get a slow motor, or turn your end points down (sometime at the club will tell you how to do this) and just practise finishing laps without crashing. Round and round and round.
100 kph down the straight looks impressive, but unless you've got the skills to get round the rest of the track with a motor like that, it ends up being slower. Each crash will cost you ~10 seconds if the marshals are on the ball.
A normal sized indoor track might take 20 or so seconds to get round. So every crash costs you half a lap.
Once you can confidently do the whole run (5 or 7 minutes) without more than a couple of crashes, start turning the wick up. Just 5% at a time.
Also, depending on what car you have, copy a set up for a similar track, and then leave it. Or ask one of the better drivers at the club.
Worry about fine tuning it later. (When you get closer to 100% on the throttle)
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