Look for a proven winner, someone who hits 55% in a given sport over a few hundred plays.
Wait for 1 of them to go on an extended losing streak (buy low) like hitting 30-40% of their last 15-20 plays.
Using a 3-4-5 money management system designate a unit amount, lets use $50 to start, so you bet to win $150 per game on a single dime (most picks) $200 on a dd, and $250 on td (gom-goy-gowhatever)
If the bad run continues for a while and you get down 25 units ($1250), raise the unit amount by 50% to $75 per unit and repeat, you can tinker with the unit size to a level you are comfortable with but make sure you keep it low enough to weather the storm and when you get back what you lost, take the unit size back down to the starting point and leave it there as you ride out the revision to the mean, which in this case will be up toward 55%.
This will allow you to be in for an entire winning run when whoever you are following bounces back.
Don't play handicapper roulette, most places pimp whoever is on a hot streak but to me, that's buying high because anyone who plays this game long enough knows that 55% is about as good as it gets over the long run and I really don't want to get on board just in time for a revision downward.
So when you see that someone has been running at 65-85% for a week or 2, it's time to worry about following that guy and at the very least, the unit size should be trimmed.
Anyhow, I could go on and on but hopefully you get what I am saying.