repaint (photoshop 7.0)

Hallo!!!First of all I would wellcome all germans to reply in Deutsch!!;-) I have some repainter questions for photoshop 7.01.How can I do round shabes, vertikal lines??and in which menue can I find them??2.How can i add alpha channel?? which programs do I need??3.How can I open textures in the right format, the PSS airbus opens, but all other ones like the EWP PRO BAE 146 doesn't because of a format error?? Do I need a program to change it into the right photoshop format?? and which??Thanks allready hope you reply!!regards Lucas Gaedeke