You are asking some big questions! lol That's okay, I've got you!
Ethyl maltol is also used as a cotton candy flavor... It definitely sweetens, but also adds it's own distinct taste to juices. It tends to round juices out and adds a certain creaminess. If you're looking for just sweeter, I would go with the sucralose sweetener. Use it very sparingly though! Try it at a drop, then two drops, etc. until you find a point where you're happy. Sucralose sweetener is very potent.
I would get the sweetener or ethyl maltol from The Flavor Apprentice.
Here you go:
Sweetener Flavor Concentrate by TFA (1oz)
As for LorAnn's... That's a flavoring company, just like Capella, The Flavor Apprentice, Flavor West, Hangsen, and Flavor Art. They have all sorts of flavorings like strawberry, apple, graham cracker, etc.
You're getting into DIY juice here. Thats where people buy their own PG, VG, Nicotine and flavorings to mix their own juice.
Once you get 5 posts, there is an entire sub-forum on DIY here:
DIY E-Liquid | E-Cigarette Forum