Installing Ubuntu on an acer aspire one 722 (AMD C60)

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http://askubuntu.com – i've been an apple and windows-user all my life, and now i bought me an netbook (acer one aspire 722) and wanted to install ubuntu (i have no experiance with any linux systems at all). i read a lot of forums but havent found my problem anywhere so i hope to find some help here. I need to install ubuntu from an USB drive. I downloaded unetbootin to creat a bootable usb- drive with my mac. I createt a bootable ubuntu (12.04) version on that and plugged it into my netbook. On my netbook i changed the bootorder so it should start from usb first but i simply get a lot of test but no installation o (HowTos)