Best thing you can do is get a teacher, IMO.
But since you're desperate I'll help you out a little.
Major scale = W W H W W W H
(W means whole step and H means half step)
So:
A major = A B C# D E F# G#
-----------------------------4-6-7-
-----------------------4-5-7-------
-----------------3-4-6-------------
-----------4-6-7-------------------
-----4-5-7-------------------------
-5-7-------------------------------
Note highlighted is F#, the relative minor of A major. To find the relative minor of a key, go backwards three half steps from the root note of the major key.
F# minor = F# G# A B C# D E
------------------------------9-10-12-14-16-17-
----------------------9-10-12------------------
-----------------9-11--------------------------
---------9-11-12-------------------------------
-9-11-12---------------------------------------
-----------------------------------------------
Chord progression = I, ii, iii, IV, V, vi, vii, VIII
(uppercase means major and lowercase means minor)
Major chord = major third and perfect fifth
Minor chord = minor third and perfect fifth
So:
--5---7---4---5---7---9----11---12--
--5---7---6---7---8---10---13---14--
--6---7---6---7---9---11---13---14--
--7---9---6---7---9---11---13---14--
--7---9---4---5---7---9----11---12--
--5---7------------------------------
I'll let someone take it from here as I'm not the fountain of guitar knowledge and I don't have much time.