How long does it take to get high of weed?

I had tried weed just 1.5 grams for myself and I got so high i felt numb all over and nearly fell asleep. Then I did like little puffs every few days. How many puffs do you think itll take me to get high. And also when I smoke weed do I take the smoke al the way into my lungs and if yes how LONG should I keep the smoke there before exhaling? It costs me $10 to get 1 gram over here in Canada. So yea please answer my question and dont tell me not to do weed please. Thanks