You have to crunch the numbers before EVERY GAME if you want to beat the odds. It’s that simple… or not simple.
If the team didn’t change much since the past season you can use your statistics from the previous season. Be wary betting on teams early on in the season that have changed a significant portion of their starting lineup. You’re practically throwing money away if you do in my opinion. Finding statistics is not the easiest thing. You’ll want to search for the sites that give you statistics and build an excel spread sheet on where to you find specific odds.
The alternative is to just bet for fun and know the bookies generally win in the long run. This is fine if you bet within your limits and just do it to make the game a little more exciting.