Welcome to the WCHA. Getting a build record, if one is available, is a good place to start. If no build record is available, send some pictures of your canoe -- people here can often id a canoe from pictures. It is always good to know what kind of canoe you have.
Before you actually do anything, you should get, or at least look at, "The Wood and Canvas Canoe: A Complete Guide to its History, Construction, Restoration, and Maintenance" by Rollin Thurlow and Jerry Stelmok, often called the "bible" of canoe repair, restoration, and maintenance. It's available through the WCHA online store, Amazon, and often used on eBay. It gives detailed information on just how to do many of the steps -- painting, canvas care, wood replacement, wood rot issues, etc. -- that may be required to bring your canoe into the condition you want.
There are videos on Youtube and elsewhere showing many of the steps in restoring a canoe.
Of course, there is lots of help available on these forums, and people will be more than happy to help with any particular problem that might arise. Just post some pictures, and ask.