Can anyone here assist me with some information?
In this day and age, no one certifies stamps by e-mail, letters must be sent. Nor is certification instant or free.
As to the material you have shown elsewhere on the SCF, are you getting the certs for you own knowledge and collecting? If not, I am not sure if the costs involved will help you sell your recently acquired materiel for anything more than you paid for it especially deducting the cost associated with selling the material, including the cost of certificates, postage and insurance. Even upper tier material can't be flipped that quickly without loss. And remember, a certificate also certifies the defects, if any, of the stamp for all to read.
Have you read this thread, http://goscf.com/t/82520&whichpage=1