Follow
this link to a previous thread on the topic. There's lots of info in that thread.
There are innumerable threads here on the various aspects of using stamps without wood. Use the "search" tool at the top right-hand corner (between "new posts" and "quick links" with the words "unmounting" and "unmounted". You'll find more than you probably wanted to know.
Since you're new, I'll warn you ahead of time that this is a very controversial topic! ;) There are lots of discussions on the advantages/disadvantages of using stamps without wood mounts, so don't get discouraged if you have to wade through some of the arguing.
There are several techniques - and of course everyone has their favorite. Only you can decide which is most comfortable for you.
Good luck!