The Kelly Criterion is sort of an advanced strategy, and even the most proficient gamers need time to grasp it. Don't be afraid to use the fractional and Half Kelly Criterion values to regulate your guess for each round. You also can use a primary card counting system and calculate your stakes for when the remaining cards worth is +1, -1, +2, -2, and so on. Start small, and once you're confident, then you can start refining your plan.