Okay, so you basically got clingfoam sheets.
Basically, what you are going to need to do is remove your stamps from the blocks (most people use a microwave to do this, but sometimes you can just peel them off) and get them so that they are just down to the bare rubber sheet. Then if you want to use cling foam you'll need to stick the bare rubber onto the sticky side of the foam sheet and cut them out.
Here are two of the many YouTube videos on how you will mount and cut the stamps using the EZ mount, just so that you can get a basic idea of what is involved.
Tutorial: Mounting Stamps using EZ Mount - YouTube
Joanna Sheen - Unmounted Rubber Stamps and EZ Mount Foam - YouTube
I am no expert on this. I've mounted stamps on EZ mount a couple of times, but they were unmounted sheets that I bought that way, so I've not done the removal from wood blocks.
I'm sure others will post to this here. If you don't get replies from people with experience on this thread, try posting in the General forum. Something like "Never unmounted stamps before, need help."
Going from wood mount to cling foam is not a difficult thing to do, but does take some time and there are tips others can give you to make it easier. Of course, you might decide you don't want to bother. But in my experience reading threads here, nearly everyone who unmounts their wood stamps finds it is worth it in terms of ease of storage and organization.
Hope this helps a little! Lots of folks on here have lots of experience, so hopefully you will hear from them.