I'm a relative newbie too, having been transcribing/reviewing just since December (and not having much time to devote here of late).
Looking at your link, seems to me you have the formatting down, and unless you plan to go back to it, you can just Submit for Review, same with the Lincoln letter.
They've added a feature that allows you to reopen a submitted transcription, so you can always go back and fill in stuff you couldn't decipher on the first round, as long as it hasn't been opened for review by someone else (and sometimes this can be a long while).
It's an awesome project, and deciphering is such a treasure hunt! Welcome and have fun.
Hi Suzanne! Thanks for taking the time to look over my amateur attempt and sharing your thoughts (and for the warm welcome). I definitely have lots of enthusiasm for this project and hope to help make a dent. - Jill