I think your example questions are good, and some may already exist or fit into an existing topic on the forum. I would do a search before you start a new topic for them. I know some similar questions have popped up in the IdentiFriday thread, for example (looong thread). Note: If a forum thread you may want to add a question to is already closed, you can message one of the moderators and ask them to reopen it for you.
You could also look at the profiles of the top identifiers for your organisms of interest and check if they have written any journal posts. Some people write a guide specific to identifying/distinguishing their favorite-to-ID taxa on iNaturalist. I’ve found some helpful tips that way and have occasionally written my own mostly as a reminder to myself. It’s also another way to contribute info to the community once you’ve figured it out for yourself. (Maybe your instructor would be willing to give extra credit for a well-researched journal post?)
Definitely ask the teacher for field guide recommendations, especially if this is a class assignment and there’s an expectation that you will key things out using a particular method.
Additional tip if the class assignment permits group work: Team up with class mates and meet for ID sessions. I teach botany in the same lab room as our entomology, mycology, and lichenology classes. I often see students come in after labs are done for the day to meet in groups with microscopes out, a stack of field guides on the table, working on ID’ing their collections together. I know you said you took pictures so that’s different from ID’ing specimens, but if others have the same assignment maybe you could still all get together (maybe even on zoom or chat) to help each other out. Big caveat: Don’t do this if your teacher would consider it cheating!