Are there any live games or sports you can gamble on prior to watching? Things like horse track racing but other options besides that. I can't seem to find much on it though I might be looking/searching under the wrong terms.
The only thing I know of is live fantasy football leagues. They track everything and you can join in and watch the games with everyone. This seems to be more for locals though since the season is ongoing.
Most sports betting places will take bets usually as early as the beginning of the season before the first game. So if you wanted to bet on the Las Vegas Raiders beating the Rams... you could find a sports bet and place the bet once you knew the game date. Betting that early might be disadvantageous though because players could get hurt or have a bad season and once you place the bet you are committed.