Familiars have an attribute of 0 across the board. So that's why they always fail an attribute test. They would be automatically targeted if monsters are to engage/spot/attack the hero with the lowest attribute of ....
I don't remember her name but there is a female healer dwarf that lets her and other hero's look through the search card until they find a potion card. That would be a huge plus if you only want to search potion cards. Even an additional plus with apothecary.
As for the app tracking win or losses, I am curious about that because maybe it would determine how it will play the upcoming quest. It would be nice if the app released the group really sucks so should go soft on them or the group is too awesome and needs to get serious. Also would be nice if it tracked what monsters used to ensure it mixes them up enough.
You will need all the deployment cards they come with well I guess only 2 of the elite troopers as that is the limit for skirmish.
As for command cards you only really need the cards from one of the sets as each set comes with the max amount of each card you can use in a game. I wouldn't toss the extras though as they are valuable. I'm sure you could sell some of them one off like renforcments for example. Or save them in case you lose a card or two.