I used the tutorials from Blenderguru https://www.youtube.com/user/AndrewPPrice from waayy back. Just following his step by step guides for different projects.
Then he did the infamous donut tutorial (atleast in the blender comunity, thats when everyone started to post picktures of donuts made with blender) for blender 2.8. It is made very well and got me up to speed with the new version. Since you don't need the actual rendering bit it will be quite fast for you.
You should be interested in the following:
Blender beginner tutorial part 1 to part 4 (51 minutes, double that as a rule of thumb), after that comes sculpting and rendering, which is a little more complicated and not actually necessary for low poly/low fidelity game models.
It will teach you the controls and the bare bones of modelling.
When you done with that you can do the Blender beginner Moddeling tutorial part 1 to the end (3 hours)
You might want to check out CJGeek, he has a different style and his tutorials are faster, but he has some good stuff that might be of use. These two videos should be a condensed version of almost everything you need.
Unfortunately I don't have any new tutorials for character animation on the radar. The old tutorials held up for me and I never needed to refresh my knowledge. Didn't watch this one fully, lllbut it should be good.If you get tiered by this point you might want to just skip the animation part or reduce the number of bones to a minimum. You can spend hours on that shit.
Last but not least you might need a way to export your result to Unity. Just google it and click the first result that stuff is trivial.
Most of the stuff you want to make has a tutorial for blender. It might be an older version though and look drastically different (we had a UI update like a year ago), but the work flow is generally the same and most hotkeys still work, so you can adapt. Most tutorials are good.
Sorry if I overwhelmed you. 3D is a big thing and learning new software is a difficult step. My offer still stands. Direct your questions at me and I will try to help.