Have you done basic latin as a gcse or do you need to start from scratch?
Edit:
Ok, I have since had a reply via pm, saying no experience of latin in the past.
In that case, I would recommend the Cambridge Latin Course, book 1 to 5. They are very simple to use, but you will proibably get tired of the characters in books 1 to 3 very quickly. These books are the staple of all gcse latin courses I know and are pretty good and self-explanatory. From memory, bk 1 is red, bk2 is blue, bk3 is green, bk4 is dark blue and bk5 is purple.