2. Yes, that rule only refers to your surname, as the Character Creation rule that you pasted states ("name or last name" means "full name or last name").
3) Signatures are created by you. Sometimes factions have design templates you can use if you are a member of their faction. Check the Art Department. There are also those who are willing to create signatures for others (including me) for a fair price.
And other's namely myself will create and host a Signature and Avatar for Free though the work wont be as Great or perfect as Mr. Gorvai's would be. :)
Damnit, people, what have I told you about whoring yourselves out in the Problem Centre? We have the street corner that is the Classifieds for a reason! Do it again and I'll have to smack your nose with a rolled up forum ban.