You can sit down with a piece of paper and figure out the scales on
your own if you don't have a circle of 5th's. It's great practice also.

Start with C major scale. The formula for figuring this out is
steps and half steps. Whole step (W) Half step (H)

In the major scale the distance between the notes fit this formula.

  W  W  H  W  W  W  H    E-F and B-C are half steps because they are
                         only one fret apart. Other than these notes,
                         we will need to sharpen a note to make it fit
                         our formula. 
Look at the G major scale below where sharps have been added. The F had
to be sharpened because if not, E would not be a whole step to F# 
and F would not be a half step to G unless sharpened to F#.

C  D  E  F  G  A  B  C 
1  2  3  4  5  6  7  8/1 Take your 5th degree which is G, that's your 
                         next scale.

G  A  B  C  D  E  F  G   again, take 5th degree which is D

D  E  F  G  A  B  C  D   Again 5th degree, A

A  B  C  D  E  F  G  A   Again 5th degree, E

E  F  G  A  B  C  D  E   Again 5th degree, B

B  C  D  E  F  G  A  B   Again 5th degree, F

F  G  A  B  C  D  E  F   Again 5th degree, C
  
C  D  E  F  G  A  B  C   This is your major scales.
This is where the circle of 5th's gets it's name. The 5th degrees.
It is almost the same for 4th's and the flat notes.

Now you need to place your sharps where they go.
The C major scale has no sharps. 

The 7th degree (below C major) is always sharp #, so in the G major
scale G  A  B  C  D  E  F#  G ---  F is sharp

                                   You always carry a sharp over to the
                                   next scale. So in the D major
                                   scale, F is already sharpened#
Scale D  E  F#  G  A  B  C#  D --- C is the 7th degree so it's sharp
                                   and it carries over to the next 
                                   scale just as F# is carried on.
Scale A  B  C#  D  E  F#  G# A --- G is the 7th degree so it's now sharp
                                   and carries over like the others.
Scale E  F#  G#  A  B  C#  D# E -- D is 7th

Scale B  C#  D#  E  F#  G#  A# B - A is 7th

Scale F# G#  A#  B  C#  D#  E#  F# -- E is 7th Notice F is sharp so this 
                                       becomes the F# major scale!!
Scale C# D# E# F# G# A# B# C# ---------this scale is all sharp making it
                                       the C# major scale.
                                       so the formula works, E#=F
                                       E# to F is a half step for the 
                                       sake of the math.  

The natural minor keys come from the 6th degree of the scales. So 
anytime you want to know the Natural minor to a major scale just
look at it's 6th degree.

As always if you have a question just ask.

flyinglibra51
God Bless Glen Travis Campbell