How to Join a table with Other (result) Tables ? Complex one !

Here is the situation

Table 1 : tbl_documents

docID docName
1 aaa
2 bbb
3 ccc

Table 2 : tbl_Rating

ratID rating docID
1 3 1
2 5 1
3 2 1
4 3 2

The queary I need is to display the result in this form. must be like this

docID docName Avaragerating
1 aaa 3
2 bbb 3
3 ccc 0

NOTE : For getting the average I used this queary “SELECT SUM(rating) As
RatingSum, COUNT(*) As RatingCount FROM tbl_Rating WHERE tbl_rating.docID =
tbl_documents.docID”

PLs help me ?

Thx
.