For prop size this is an excellent resource, it will attempt to get you to pay for it but there is everything you need available free.
www.ecalc.ch/motorcalc.php
first select battery size
then esc size
then you need to dig through the motors, find a motor that is the closest match to yours in terms of power rating and KV.
throw on the prop you are using.
this will tell you the 3 important things that you need to know.
Current draw (amps)
thrust in Grams
thrust speed.
Current draw needs to be what the batteries are capable of putting out as well as esc rating and motor rating.
thrust in grams should always be more than what the model weighs
thrust speed is a little tricker its model dependant. this motor is in a yak I think? so somewhere around 50 mph is a good place to start.
by adjusting the diameter and pitch of the prop you can change all 3 of those, generally go up in pitch to get the pitch speed then go up in diameter to get the amps up to a sensible figure.