Lots of other Good Advice on size of lines, so I won't add to it. One
thing I learned (from a powerboater!) was the convenience of a "midship
line". If you're coming in to a tricky dock, esp. with minimal crew (like
singlehanded!): You tie off the bow, and stern goes away on you. Tie the
stern, and off goes the bow. Tie a midship line, and you got 'er!

Then, of course, add bow, stern and stringers at your leasure. I usually
leave the midship line on, "just in case".

Lloyd Sumpter
"Far Cove" Catalina 36 - off to Desolation Sound next week!