Going Ivern as your first jungler could be a bit of a strange way to start, as he has the ability to clear camps without fighting them, along with having unique paths he can take. Honestly, if you wanted to learn jungle I think it would make more sense to learn as some of the easier jungle champions to become better at the jungling tricks (ganking, objective calling, smiting, pathing, etc.) before you start up with Ivern, so that way you already know the basics behind the jungle before you give him a go. Then again, you can also just do whatever you want and start with Ivern, as no one can stop ya lol.
This is just the way I see it though.