weak carbonaiton

i opened my first bottle the other day. i get a good pop when i take off the cap some bubbles and i get a ok head for a couple of second then it goes away. the beer taste a bit flat, but when i pour it out i can see bubbles. the batch was an oktoberfest lager. im not to sure if it hasn't carbonated enough or i made an error some place. on the plus side it's stronger then i thought it would be

can anyone tell me what i did so i dont do it again. i have a cherry stout im going to be bottleing in a few days.

More info, please:

What did you prime with?
How long since you bottled?
What temps has it been conditioning at?

well sorry im new to this. well the directinos told to keep in temp of 35 45. so i had it in a mini frid for about 8 week then i bottled the only fool thing i did was put all the bottles back in the fridge. i was wondering why there was carbonation. i call the company and then told me to take them out of fridge and they would carbonate. they did and so far i still have them out of the fridge. there in my office and the temp is 65 to 70. im not in there to often so i can lower it even more. i hope this hepls you.

How long since you took them out of the fridge? Three weeks or so after that date, you should be good to go. 65-70 will be fine for carbing.

thanks, so i have about two more weeks to go then. man im learning a whole lot from this site.