Hi guys pretty new to the whole NFL scene but anything as awe inspiring and well followed as this has got to be ok.

Just wanted to ask a few question about the whole draft system you guys have merely out of curiosity..

Is every single player free to trade each season?
how do these trades occur if no compensation fees between the 2 clubs are paid?
who exactly decides the 1st draft pick?
who this season was the 1st draft pick and why?
Can a player reject a certain franchise for any reason?