Agree with everyone else; also, there are some good lessons here on GT about music theory which you could read. If there's anything you're not sure about, just ask a question in the relevant section - there's always plenty of people willing to help out.

Most importantly of all, don't give up. It could take days, weeks - maybe even months, (took me nearly four months to work out how to play from tabs for example), but it will eventually click. Remember, everyone started somewhere, so don't be too put-off if it doesn't happen straight away. Just stick with it and don't be afraid to ask for help.

Hope that's of some use!