If so, how will those rights be enforced? If those rights are enforced by voluntary collective policing, in what way can I defend myself against their declarations of more implicit rights? Basically, if I draw a picture of Mohammed, have I initiated force? What about if you leave your door unlocked, I walk into your house, then drink your milk straight out of the carton? Is this an initiation of force, and if it is, what if you lack the size to prevent me from doing it?
Lastly, if I walk down skid row with a private bodyguard and a wad of $100 bills, offering to buy people as slaves? If they sign, are they my slaves? If they escape, have they initiated force? Is there an involuntary limit to what can be signed away?
tl;dr I'm not getting a clear idea of who defines initiation of force, who enforces violations, and how are the weak protected from the strong. I realize the last one may be a bit of a straw man, because libertarians may not feel that protecting the weak from the strong is moral, but I'm not sure about this.