A beginner stack should have all of the following throughout the day
Fish oils
Whey protein (morning, pre/post workout)
Casein Protein (before bed to stay anabolic throughout the night)
Multivitamin/multimineral
Flax seed if u so desire
Creatine Monohydrate
That's the most basic stack u can get.
For post workout you need some form of maltodextrin/dextrose for your post workout insulin spike, and you need about 50 to 60g of whey protein right away to start the protein synthesis