depends on position, in early position, on premium hands like AA, AK, AQ, KK, QQ, KQ, should be played.
In later position, you can open it it alittle bit.
Buy-in? Turbo? MTT/SNG? Need some info. Generally, as a beginner on low stake SNG's I'd say that you may play something like J-10+, K-J+, A-10+, 2-2+. However, the most important thing to start with as a new player is to raise the hands you want to play and not call. Limping usually makes you end up playing way too many hands, paying you off poorly when you hit and wasting chips when you don't.