The first question you should ask when thinking about whether or not to bet on football is if it is legal. The answer is no; it is not legal and it never will be legal, unless the United States Supreme Court makes a ruling that would make it legal.
There are other questions you should ask such as: Is this sport safe? Does it have any risk involved? And, which players will win and which players will lose?
So, if you get into a game, are you going to bet on every team, every player, or just the game? If it is just the game, are you going to bet on every touchdown, every field goal, every punt, every foul, every turnover, every special teams play, or just on the winner? If it is just the game, are you going to bet on every kickoff or just the return? If you are going to bet on a team, just which team is it, is it in your opinion a better team or is it just a mirror image of another team that is legal betting? Can you afford to pay the cost of betting in addition to your favorite team’s regular season game ticket price?
Professional football league rules require the referee to check with each side of the ball at the beginning of every play, before and after a change of possession, to determine which team is actually “onside” before the snap. But, one play can change everything, and a referee can change his mind about whether or not it is “offside” at the last second.
The above questions all lead back to one crucial point: If you are not willing to take the time to study the rules, then you cannot claim to be an expert in gambling. You can sit down in your living room and watch the games you enjoy most. However, to be good at the game, you need to know all the ins and outs. If you do not know how the ball is caught by the defenders, how the fielders reach the end zone, etc., then you cannot bet on football.
In short, legal or not, betting on football is gambling. And if you are not willing to pay for the game, then you cannot claim to be an expert in gambling.