Odds of +200 mean you can winR$200 on aR$100 bet, but there's no quick way to determine the implied winning probability. If these odds appeared as fractional odds 2/1 you could quickly solve for the implied winning probability using this formula: Decimal / (Numerator + Denominator) x 100%
You usually get a set amount of money to bet when you deposit and that money can't be redeemable for cash. For example, if you bet the bonusR$5 and lose, that money is gone. If you betR$5 and profit anotherR$5, you'll be upR$5 in real money.