Overstreet puts out grading guide book, with pics, $24.95, maybe less on shopping sites:
https://www.gemstonepub.com/en/the-overstreet-guide-to-grading-comics-2016-edition .that will have the most details and images, from the main authority on comics.

CPG has a grading guide: https://comicspriceguide.com/comic-book-grading
CGC has a grading guide/scale, but very general: https://www.cgccomics.com/grading/grading-scale/

There's many other sites with Overstreet's grading definitions too (shorter text versions), a google search will show you.
You can post a good scan in the Grading forum here and let others give their opinion, but it's not super accurate to grade from scans cuz of all the defects scans won't show. https://comicspriceguide.com/forum/forum12-comic-grading-tips-and-tricks.aspx

CGC has 2 grading forums, one to post pics and ask what grade: https://www.cgccomics.com/boards/forum/42-hey-buddy-can-you-spare-a-grade/ . They have lots of experienced people there, and have grading contests too.
and another for grading/resto info and questions, with good info on the pinned threads: https://www.cgccomics.com/boards/forum/27-comic-book-grading-and-restoration-issues/

SCANS are better than camera pics, but if a camera is all you have, that'll have to do. Always note stuff that's hard to see, like light stains, finger/thumb kinks, stress wrinkles on white covers, spine kinks that don't break color but the ''divot'' is there, tears that might blend in well, spine splits, etc.

Good luck on 'em.
edited by collectibleshop on 10/11/2020
edited by collectibleshop on 10/11/2020

This website has a really good walkthrough about grading. You can find it here: CPG Grading Guide.

You mean Green Lantern #1 & 2, not golden. saw it on auction. and you ARE member of this site since you have a user name. and you do know if you join CGC Collector's Society you get a discount on the grading, and free graders notes, right? for comics in this price and age range it's well worth it, as your membership fee (premium on up) is credited towards grading fees, and you get to submit direct to CGC.
I have no selling advice, sorry.
edited by collectibleshop on 10/10/2020