You got that confused, to vote you had to be a male citizen of Rome. Now there were three ways to be a citizen, one is to be born by parents who were both Roman citizens, two be declared a Roman Citizen by a Caesar or three join the Roman military and after 25 years of service at retirement from the military you were made a Roman citizen with your own land and a nice pention.
As well, ownership (and by extension trade) was limited to citizens. See above about how this is hardly defined as 'free'.
Yes and no, it depended on what type of property and where it was located. A lot of trade happened in the Roman nation and not all of it by Roman citizens.
For example: (History Channel's special on the Gaul) the Gauls, after centuries of being enslaved by the Romans, were finally given their own homes lands in the Roman Nation and were allowed to trade.
I would fairly wager that I've forgotten more about Roman history than you'll ever hope to know, so why don't you get back to me when you've got a clue? Alright, cuz?
It is not so much that you have forgotten, but that you have the information on the different eras in Ancient Rome all jumbled together in your head.