The Kdenlive manual can be found on KDE's Userbase server: http://userbase.kde.org/Kdenlive/Manual. Help is welcome if you want to add content. This online documentation is being integrated into Kdenlive's help that is distributed with the binary packages.
You can also search and ask your questions in our Forums and Video tutorials. You can also connect with other Kdenlive users and developers on freenode's #kdenlive irc channel or through our dedicated page.
To check if your camcorder is supported by Kdenlive, check our Camcorder list where you can also add info about your camcorder's compatibility.