You'll be able to withdraw your winnings only after you have met the bonus wagering requirement. Depending on the bonus, your deposit amount, bonus amount or winnings (if any) can be restricted to a specific product, sport, sports league, game or group of games.
You can't withdraw bonus bets or bet credits, but you can withdraw winnings. Bet credits and bonus bets cannot be withdrawn, but they can be used to wager on other sporting markets your sportsbook has to offer. Some sportsbooks make you use your bonus funds or bet credits in one lump sum.