First step completed. it is especially good that your bookie bet lost and you won the lay at BF as you now don't have to withdraw from the bookie. i hope the cost/loss of your free bet wasn't much more than 50p ish?
Now you have to do the same thing again. The only difference is now your back bet is not your own money!. As this bet is free, Coral wont give you the £10 stake back (stake not returned or SNR), they will just hand over any winnings. For this reason the odds have to be higher. At 6 or 7 and above the bet starts to become profitable - any less and you are throwing your free money away !
SNR means the stake forfeit box comes into play for free bets. You must enter the same amount in here as is the same value as the free bet amount. In this case the back stake is a (free) £10. Stake forfeit is also 10.
You will need to top up your BF account as you have stated to cover the lay risk. No problem - just treat BF as another bank account. Pretty soon you will have enough in there to cover all your bets and none of it will have come from your pocket
Try the monday footie between liverpool v west ham.
West ham to win 13@coral and 14@BF. Yes you will need to deposit a bit but you are going to need it in there in any case
Do this and you are well on your way. Next just move on to another bookie. If you selected coral for your first bet because it's a familiar name, then no need to worry. The list is designed for newbies and best started at the top and work your way down (well until about half way anyway, then just go where the mood takes you