i've been dabbling in vectors (using mainly the illustrator app) for about a decade now so i'm fairly comfortable with it. i think practise has to be the main instigator when it comes to learning vectors. you'll gradually find a style you're comfortable with (i'm still searching ).
as for using flash, i remember trying it out when it was first released and i absolutely hated it because of her awkward gui so i avoided her for many years until recently, due to being the medium of choice on the internets for many reasons. but see, i don't use the flash app at all. i export my vectors directly as a .swf so this eliminates the usage of flash entirely. hee hee