SQL Help

I have 2 tables

ARAMIS @ UKDB02P2>desc arm_sub_project
 Name                                                 Null?    Type
 ---------------------------------------------------- -------- ----------------
 SUB_PROJECT_NUMBER                                   NOT NULL NUMBER(7)
 DATE_CREATED                                         NOT NULL DATE
 STATUS                                               NOT NULL CHAR(1)
 PROJECT                                              NOT NULL NUMBER(7)
 APPROVED                                                      CHAR(1)
 
ARAMIS @ UKDB02P2>desc arm_sub_project_budget_line
 Name                                                 Null?    Type
 ---------------------------------------------------- -------- -----------------
 BUDGET_LINE                                          NOT NULL NUMBER
 SUB_PROJECT_NUMBER                                   NOT NULL NUMBER(7)
 CATEGORY_AVAILABLE                                   NOT NULL NUMBER
 COMPANY_NUMBER                                       NOT NULL NUMBER

and have now been asked to write a sql which would display the following:

MONTH/YEAR from table 1
SUB_PROJECT_NUMBER from table 2
MIN(COUNT(BUDGET_LINE)) from table 2
MAX(COUNT(BUDGET_LINE)) from table 2
AVG(COUNT(BUDGET_LINE)) from table 2

i.e to put in words, for each month/year the project manager wanst to see the total number of budget_lines, minimum number of budget_lines and maximum number of budget_lines for each sub_project_number

Thanks!
Ali