Re: Starting at square one
a cranebrook is one of the harder bikes to mount a motor on for a first timer. it has an over sized front tube that the motor won't fit, will need a custom front mount. it also needs the coaster brake arm to be bent and has little tire to motor side chain clearance. it can be done if you have a little fab skill but is not the best choise for a first build.
the easiest bikes to put a motor on are old 70's style 10 speeds. everything bolts right up, once you get the hang of the care and feeding of a motor bike then make your future builds more complex. belive me once you build one you'll be back for more.