Trial deck upgrading

Recently returning to Vanguard after a Almsot 4 year hiatus, played the dear days demo and got a quick run down from an old friend on how to play. I ended up buying the following 4 start up trial decks just as a starting point to teach my wife and re- learn - Dark States -Brandt Gate -Keter Sanctuary -Stoicheia

How would I best upgrade and tweak these decks in order to make them more playable and not so vanilla? Is it worth using these decks as guides or should I just build something from scratch? Any help welcome!

Also as an additional is there any online retailers to buy vanguard products/single that ships within Canada?