TABLES IN SD(Sales & Distribution)

Hi Guys,

I am part of Migration Project.here we are mapping the Fields of SAP with Peoplesoft. Now we are carrying with SD Module of SAP. there are lot of things Confusing me in SD. First of all the fallowing tables in SD Related to Sales Order i will name a few

VBBE

VBLB

VBPA

VBAP

VBKD

VBEP

the above tables having the info of sales Order as i am new to this terminology any one please Explain me wat is sales Order , Billing Documents, Shipping And Delivery. In SD How Document Moves From One Department to other in SD.

Thanks

Kiran.B