I am needing help with doing a couple of statements for SQL

I have created these two tables:

CREATE TABLE Stock

$($

Stock$\_$ID VARCHAR$(10)$ NOT NULL Primary Key,

Stock$\_$category VARCHAR$(25),$

Stock$\_$shelf VARCHAR$(30),$

Stock$\_$price VARCHAR$(10),$

Stock$\_$quantity INT

$)$

GO

CREATE TABLE Sales

$($

Transaction$\_$ID INT NOT NULL Primary Key,

Customer$\_$ID INT,

Stock$\_$ID VARCHAR$(10),$

Sale$\_$date VARCHAR$(20),$

Quantity INT

$)$

I need help with the following queries:

$($d$)$ Display all records from Sales, grouped by customer.

$($e$)$ Display the total sale value per customer, sorted by customer, for a given date of sales.

$($f$)$ Display sales value, category$-$wise, sorted by date.