hey im very new to using unity but, is it possible to create a deck of cards and being able to add a certain amount to a hand, these will be a custom set of cards that would need to be random any help would be appreciated thanks
You should consider going through some tutorials in the learn section: Learn
Get a feel for using Unity (Unity interface and essentials tutorials), as well as scripting introduction ones.
Try some small game tutorials on the site for some experience.
Of course what you described is possible