What do you have for your guitar?
Do you have a tuner? An amp? And two guitar cords that can go into the tuner? Sometimes guitars don't come tuned already so the sound is bad. When you read tablature, it doesn't give you the timing for songs, thats the bad thing, you have to listen to the song and time it yourself.
6:
5:
4:---------------------------------0
3:---4---0------4--0------4---0---
2: 2---2----------------2---2----
1:-------------3--3---------------
Say something like this, this is the intro piece for Metallica's One. You would play the 2nd fret, on the second string first, then the 4rth on the third string and so on. 0 means no string is pressed down.
How To Read Guitar Tab
If your getting an odd sound you may not be putting your finger in the right place.
The first fret is in between the top of the neck of the guitar and the first metal piece, you press down the string against the wood and have your finger close to the center of the string.