Lightning, installing deck cleat

Just bought a 14,000 series Lightning, it had been dry sailed & we will be keeping it @ a mooring. We need to install a cleat or some way to attach the mooring line to the boat, any advice on this? Presently there is a shock cord running mid way from bow to just forward of the mast step.
Also any ideas on how to figure out the waterline of the boat before applying bottom paint. I'm new at this!
TY

 

A mooring line should lead from the bow eye to the mooring float unless there is a chock installed on the fordeck to lead the pennent around the stem and to a cleat. On small sailboats that are often dry-sailed, chocks can be non-existant. Your bow eye is very strong and it often leads from lower down, which is preferable anyway.
A simple but beefy stainless carbiner seized to the mooring loop can be used to clip onto the bow eye.