Advice for proper propeller for 2000 218 Shabah 5.0 merc I/O 250 H.P.
 

I just purchased my 2000 Mariah Shabah 218, 21ft boat from a gentleman who was too elderly to keep up with it anymore. My problem is it did not come with a propeller and I'm not sure what size to place on it. My main function will be for play, ie: tubing, waterskiing ,wakeboarding etc. I will be carrying aproximately 2 to 3 adults and maybe a small child or two. Any advice?

Help on the Hudson needed!!!!!!