The first thing I would recomend,if you don't want to find a good teacher,is get a good song and chord book. Try to learn four simple chords,G,C,D,and E minor. If you are familier with old gospel hymns,learn to play them.If not,try to get some songs that you know that are in the key of "G". Also,try a acoustic first,the mistakes will come out better,and you'll be able to correct them.