Perseverance is the best advice for anyone wanting to play the guitar. It will be painful on your hands and fingers for a while, but try and push through that – it will soon pass. I’m not a believer in talent, I believe in desire – you must want to play more than anything. But you must get a good quality guitar, and preferably one that you choose yourself. If you have a clear connection to that particular guitar from the beginning it will mean more to you. A guitar is a friend and you should want to be with it.
I think it’s best to start learning with chords on the top (high) four strings. The chords are then easier to form and understand and when you have learned a few good shapes on four strings the whole chord will come easier later.
If you really like certain songs learn to play the chords, however slowly. Then make sure the right hand (if you are right handed) keeps a good rhythm. I always think the right hand can make people tap their feet to a good groove – so keep that groove – and when you play always go to the end of the song. Try not to stop in the middle – just go past your mistakes and move on along the song. Stopping in the middle never works.
And finally, I know it seems obvious but maybe most important of all, make sure your guitar is perfectly in tune when you play. Buy a tuner, and keep your guitar well tuned, otherwise, no matter how good you get, it will never sound great.