Read Stamp Smarter or invest money in a set of catalogs.https://stampsmarter.org/learning/M...methods.html
You appear to be starting with the assumption that you have the rarest varieties. Stamps are as common as rock, imagine that you go into your back yard, pick up a rock, and want to ID the rock type. If you start with the assumption that it is a diamond can you see how it makes your process more difficult? Or imagine that you find a lottery ticket on the sidewalk, would you assume that it was a mega winning ticket?
Please consider starting with the assumption that you have the most common variety. It will make your ID process go much quicker (because you will find that you that have the most common varieties the overwhelming majority of the time ). This will also prevent alienating many of the people in this community who want to help you.