Previous post is excellent. Here is another more immediate source of info:
They have patterns for thousands of boats and can give you an immediate free estimate. There are some samples if you click on "Dodgers"($1300.) and "Biminis"($1000.)
Then there is my way: www.sailrite.com . Bought a decent sewing machine and made my bimini, fender covers, and keep the sail covers patched.
Next is to replace the very old Island Nautical dodger. A friend did all of his canvas, hope you can cut and paste this: