Your SEP hours might help you in that you are used to being in the air and so on, but you will have to go through the same 'in the air' training as everyone else to get solo, and then to pass the Bronze C flying test. However you should waltz through the Bronze C exam - unless you got your PPL so long ago you've forgotten the written stuff... You will already have an RT licence and be in practise using it, you do PFLs and hopefully your navigation will be fine so getting the XC endorsement should be OK.
Prepare yourself for the relative peace & quiet, for having to use the rudder pedals in the air, for there being (usually) no such thing as level flight and for no go-arounds...