Man i really think you are on the good way. Just have in mind, practising is the best tool to be a good musician, just as the majority already said and it doesn't matter what instrument you are playing, practise as much as you can, if you really want to be a good musician then i suggest to practise every day.
There are lots off guitarlearning sites on the internet, just google for them!
Here are 2 sites for the guitarscales:
Sa re ga ma pa dha ni sa = Do re mi fa sol la si do
So for the C major scale this is:
C D E F G A B C
If you found the tabs for this and it doesn't sound good, maybe the tabs aren't right or your guitar isn't tuned well or as you already said, maybe you are tone deaf( i don't hope so!)
Take care man and good luck!!!