#1: Not sure what to tell you , but virtually 100% of male ancestors I've found were simple farmers. Getting credible documentation gets difficult before 1860 and really difficult before 1790 (in the US) unless your ancestors were otherwise notable.
#2: I've been doing pretty serious research for 5 years, of course I know about familysearch.org. I've found some good things there, but the proving what is in the tree is very difficult.
#3 & #4: I don't care about relatives, only direct ancestors. I do not believe I am directly descended from any sort of British king else a connection would have been made already.
#5: My father's line traces it's roots entirely before the Revolutionary War, and so it gets far enough back that you can't really prove that some name on a ship manifest is the actual ancestor in my line. I consider them tentative links. The surnames involved are too common in my case (Go ahead, prove one Thomas James from 1700 is the same Thomas James mentioned on some document in 1670 :D)
I was under the influence of a couple drinks last night, so allow me to further explain the question.
In my case, I can reliably get back to ~1700 with my surname. Am I "American" (yea anachronistic ). If I go just a bit further it is believed that they came from Wales. So am I welsh? My paternal grandmother's line is Scottish as far as I can trace it, which is late 18th century. My mother is from England, born of an Irish father and English mother. So I guess I'm either all British or Colonial American.
But of course that's arbitrary. All those people came from some where. Where were they in 1066? Norman? Saxon? Brits? And how about 410 when the Roman Empire left Britannia?
So it is this line of thinking that bothers me. Where you come from and who you "are" is arbitrary based on how far you want or can look back.