Here's a brief overview:
1) Generate ability scores. (4d6, take the three highest, arrange to taste.)
2) Pick a homeworld, or randomly generate one using the tables in the THB. From there, you gain a free feat (or three, if you're from an asteroid belt or vacuum world), and select three points worth of homeworld related skills.
3) Generate a first level character of the original class.
4) Go through Prior History, levelling up the character at the end of each term.
5) Muster out and buy equipment.
Then you're done. There's too much information for your specific request for me to be specific about everything, but that's the jist of it, from my experience. You will definitely need the book to get much further than step one.
Hope this helps,
Flynn