Plastering entrance walls

[Moggaman]

Hi. I have decided to plaster my site entrance walls myself. Some questions for you experts!:

1. I intend to scud, scratch and finish coat..with 2 coat plastering beads. Is this overkill or should I scud and finish with single layer bead.

2. Is 5 to 1 mix ok for finish coat and scratch?.

3: how much plasticiser and waterproofer should I add for a typical small electric mixer.

4: what type of waterproofer is needed 

5: plastic float the wall and then run with a damp sponge?

6: is it best to apply beads before scudding or after scudding or after scratch? Is mortar the typical way to fix beads on ?

 

any help appreciated. 
thanks