Mate take a few hours and drive to some boat ramps and see some methods being used first hand, it's what I did and helped a lot!
The old Ski boat I used a bow line with long rope
With the old 4.3 tinny I simply pushed off and beached if possible cause it was so light
the new 5.2 glass boat I have I get in power the motor in forward lean over the bow to undo the straps and chains ( motor in forward holds the boat ) then simple back off.
Trailer set up and depth come into it but you'll pick it up quick and find what best suits you
Most boaties are patient when your on your own,