Welcome to the community and the hobby.
The Washington/Franklin series of stamps can be quite challenging. The coils are easily 'made' (trimming fully perforated stamps to look like a coil) so beware those which appear to have a smaller dimension.
Typically start with the assumption that the stamps you have are the most common varieties. If you run into a stamp that appears to be a rare stamp, search for the possibility that it is probably a forgeries and/or altered stamp.
Here is a link which provides many resources which should be helpful to you.
http://stampsmarter.com/1847usa/1847Home.htmlDon