In the currency system, for example

(1) if I as an attacker in the main chain to choose a node for the extension of branch, alone to each piece will have rewards? At the same time, network node of the transactions is packaged by me, or was the main chain new piece of packing?

(2) once my branch length is more than the main chain, and instead become the new main chain, abandoned piece of distribute the reward will be recycled?