Many, most, if not all of us here Perfumer Hobbyists, and also Hobbyist turned Professional, are self taught. There's just a couple of formally trained perfumers here and then also in the Artisanal world. 'Couple' may be an exaggeration of course, but the vast majority are self trained, like myself.
Starting with all Naturals *can* give you an easy access to Perfumery, because you have existing knowledge of these naturals because of knowing some cooking things, or smelling these oils by way of their plants in Nature directly.
The thing about using all naturals only, is that you aren't going to easily, or sometimes ever, get a fresh flower odor profile from naturals only. The vast majority of the time, you need to use a synthetic item or several items to construct that odor profile. You *CAN* buy a natural isolate where the molecule is the same as a synthetic molecule, But be warned it will cost 10X to +$ up and +$ up more to buy the isolated molecule, versus the synthetically made molecule. To me, and most people on this DIY forum, a Molecule is a molecule, is a molecule. And since a molecule is a molecule, why pay the exhorbitant amounts to subscribe to a religion/philosphy?
So my best advice is to learn what you can in the natural groups/curriculum/mindset, and then use that knowledge to move beyond this self imposed limitation to become a full perfumer with a full palette of materials to work with.
But, after you move beyond that Natural curriculum, I'm not so aware of any study at home curriculum available. You're on your own to learn through groups and your own drive to build your library and your knowledge. There certainly ARE tools availble, but not a curriculum that I am aware of, apart from workshops and classes that can be taken in person at the lab/office/or home of different Perfumers around the world, that are availble for anyone to be a part of.
Best to you on your journey...