at the end of 2012 I paid to craigslist poster service by bitcoin. I do not remember method of payment details but checked emails and discovered that I used '' MT.Gox" ," bitstamp coupons ", and I had problems with " Bitinstant" also I made payment by "zip zap"( like moneygramm). I can not find a way to check do I have some bitcoin in my wallet or not and where is that wallet is. Please help me find out my balance
If you only used Mt.Gox "bitstamp coupons" probably all your money is gone as Mt.Gox has failed in early 2014 and his owner is in jail in Japan.
If you have used Bitcoin Core as that was the most used wallet at that time do a search in your PC and search for "wallet.dat". If you haven't formatted your PC since then it should be in your PC ,usually at %appdata% at a folder named Bitcoin-qt there. If it is password protected you should remember your password otherwise your chances to open it are very slim. Check if you have wallet.dat in your PC and let me know so I can tell you what to do next.