Can someone give me the low down on the best weapon to use for each class please and thank you.

Yikes - do you want the basic set or best ones after ranking up or doing challenges?
LOL
Anyway here are mine - I betcha there is some agreement but also a TON of variation - also it all depends on the map even within the classes so and my favorite is 2 in every class (No spelling pride here, but they are all close):
Assault = Auto = Ribeyrolls and Semi-auto = Turner
Medic = MP40 always a favorite in WW2 and ZH something
Support = Lewis and MG1922
Recon = Bolt = New one the hard hitting LS whatever and Self-loading =  ZH29
Pistol = always the Revolver
Anti -tank = Panzerfaust

All weapons except the latest bolt action medic weapons a re good depending on how you use them - gotta experiment

Having fun! Good luck!

https://www.youtube.com/watch?v=THhKx1vVOhY