Call Christina Westphal
, who advertises on TT, and meet with her. She will get you sorted out, is very knowledgeable, speaks fluent English and has tons of experience helping English speaking Selbständigers from TT.
Do yourself a HUGE favor and don't try to go the cheap route and figure out everything yourself. Even if you speak fluent German, the tax system is much too complicated, and it will be impossible to coherently piece together the odd bits of info you are able to glean from TT.
Christina is very reasonably priced and, in my case, I haven't been charged anything until she does my 2005 taxes later this year.
BTW: I am self-employed and have been through all of the growing pains that you are going to experience getting things straight with the Finanzamt.