Click start > Settings > Control panel > Mouse > Pointers. Select the pointer you wish to use then click apply then click ok. I would advise you not to change the speed of the mouse...
I believe you can't do that..sorry. The only way u can dress ur avatar is DOWNLOADING the 3D client.
flowing
Youtube.
Oovoo doesn't really have any other way to get it other than to download it. I would very much suggest you get Skype.