In ESO you can make up to 7 alts, each alt will start with 3 skill points.
Make 7 alts in the Daggerfall Covenant faction, in this starting city the bank and crafting area is close to eachother.
Now with the 3 points get one level minion in each profession, if you want a enchanting minion aswell you need to get two skyshards. You allready have one.
See here for the skyshard locations
Now you have 32 minions, on my main I have level 3 minions in each craftingline. Every 24 hours every single alt will get 4 mails with a bag with the corresponding crafting materials, normaly since you are using a level 1 minion the chance of getting a good item is low.
Now here is trick, only log into the alts and go to the mailtab but dont take the item out of the mail. Instead log-out and log back into a other alt and repeat.
Now since the mail in ESO is linked between alts, log into your main with the level 3 minions and collect the bags with crafting materials.
Edit: (Thanks for the info Sylph027)
The contents are determined by the openers crafting level in that profession, the chance of better crafting items is also determined by minion level. So open the corresponding box with the char with the highest minion / prof level.