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Before even talking about sportbetting and casinos which are the most reliable and trustworthy around here. Do you even know how to use Bitcoin or manage cryptocurrencies in a safe manner, so you won't end up losing it all to scammers or fake applications, fake casinos or fake wallets.
You just talk about gambling and since you just said you are completely new within this world of gambling and sport betting, it would be useful if you told us what cryptocurrency you intend to use for your wager and also, what can of wallet you have at your disposal, so you can get your deposits and withdrawals through, in a seamless way.
There is not always about the fact there are casinos out there which one is supposed to avoid at all cost (because they selectively scam their gamblers) one also needs to take a look and do some research on the coins you are going to use to bet and the wallet you Re going to use to store them.
If your plan is to bet heavily on sports, then I would suggest you to make a 50$ investment and get your hands on a hardware wallet in the first place.
Anyways, wish ya good luck with your journey in this ecosystem. Always be aware of scammers and fake tipsters, please.