I’ve known how to play blackjack for years but I never got into it until like a couple weeks ago. Ive been researching about card counting and I was just wondering when I should make big bets. The casino works with 6 decks and I understand that 2-6 is +1 and 10-Ace is -1……so should I wait until 3 or 4 decks of cards have been dealt and then make bigger bets if the count is good? Or should I start betting higher as soon as the count is a +?

Ya .. might have it backwords there… small cards are a – big are + you want to bet in a – situation. The fewer smaller cards in the deck the better ( 4 U )… Dealer has less chance of getting a 17.
You playing a 6 deck shoe… played 2/3 of the way.. the count is – 15 or better.. Time to rock.. ( In my book )
There is SO much to answering this question correctly. You aren’t going to learn what you need to learn from this forum. It depends on your count. It depends on how deep you are into the shoe. It depends on your bankroll. To do card counting right, you really need to read a book thoroughly and study a lot until you’ve got everything down cold. It’s not a simple thing to count cards correctly.
mr.longshot has it backwards, by the way. You were correct in saying that you start thinking of making larger bets with a plus count, not a minus. (Unless he has some sort of system that’s backwards from all the other systems out there. Perhaps every time a low card comes out, he calls that -1. Again, that would be different from just about everyone on the planet.
Take the running count and divide it by the number of decks left in the shoe. Experienced card counters can look at a shoe and know with great accuracy how many decks are left. If you have a running count of 10 and there are 4 decks left, then you have a true count of 2.5. That’s good but not great.
Some card counters wager their better unit times the true count. A true count of 2 and a better until of $50 means $100 wagered on a plus 2 count. A plus three would be $150.
Just for fun I could cards at home using a double deck with seven players. I am accurate on the running account less than 50% of the time. On a single deck I nail it 90% of the time.
Do I count cards in a casino? Oh hell no. I’d get hammered if I did. I’d lose big. If I can’t get the count right at home with no noise and distractions, then I can’t get it right in any casino.