New at this

Hi everyone, 
 
I recently was given my late grandfathers very large stamp collection. I am in awe of all the beautiful stamps. I asked my grandmother where he had gotten them and she told me World of Stamps. I can’t seem to find that website but all of these stamps come on a sheet and each stamp tells a story. I would like to continue to collect the stamps like these and was hoping you would be able to help me find them. He also collected Readers Digest stamps but I know  they don’t do those anymore. 
 
Thanks for all your help
 
Trisha