SQL Server 2008 :: Using Cursors To Find First / Highest And Last Values

I have basic knowledge of T-SQL and I am using Cursors to get the first value, the last value and the peak value and some other values from other tables. I found some examples on google but the code I am using is mixed up. I am using multiple Cursors. I need to join three tables to get the result set into the Cursor. The first example uses 2 tables.

@FirstName NVARCHAR,
@LastName NVARCHAR,
@FirstValue decimal,
@HighestValue decimal,
@LastValue decimal

-- First Cursor

DECLARE TESTCURSOR CURSOR
DYNAMIC

[Code] ....

The above code seems totally inefficient but it gives the correct result. Now I want to pull some more value and join a third table (TABLE z) in the above CURSORS and not sure how to make it working using CURSORS.I would like to use the following in the CURSORS above.

SELECT x.publishdate, y.firstname, y.lastname, y.age, z.initialValue AS FirstValue, z.HighestValue AS Highest, z.LastValue AS Last
FROM TABLE x
LEFT OUTER JOIN TABLE y
ON x.id = y.id
INNER JOIN TABLE z
ON x.id = z.id