A few years ago (I am 30) I bought one of those kits for about 8 year olds and taught myself - it worked really well. I would suggest finding a group of knitters too. It is much easier to have someone show you in person and there are groups all over - at yarn stores, community centers, churches and the internet groups.
I buy lots of yarn from www.knitpicks.com
for their prices and how they have patterns to go with each yarn.
Good luck with it all!!