Read a lot about design. There's hundreds books you can start, I particulary love grid/typography books, they cover about 80% of the design topics. You can als

Read a lot about design. There's hundreds books you can start, I particulary love grid/typography books, they cover about 80% of the design topics. You can also improve your skills using software by watching screencasts. If you have money, Lynda.com and many others are available by searching google. If you don't you can rely on Youtube, many people there post tutorials.