I don't really understand what you're saying, but: Why not stick with stable long-term support 12.04 for a while longer, read up on basic concepts (upgrades, partitions, backups---all well-documented on the ubuntu site), and upgrade when you're feeling more confident? Is there a problem with 12.04??
If you want to just throw caution to the wind and go for it, this page is 1st google hit for "upgrade ubuntu:"
easy as 1-2-3!