You start by learning as much music theory as you can. Music starts in you mind, so that's where you should start. Make sure to learn all your black and white notes on your keyboard before you do anything. If you don't know your notes, you gonna have a hard time. After that, start with information on scales, progressions, and basic chords. Here is a little Basic Music Theory page for you:
BASIC MUSIC THEORY
Keyboard make-up
The keyboard uses the first 7 letters of the alphabet: A B C D E F G
A piano/keyboard is made up of black and white notes. The white notes are the regular letters. The black notes can mean 2 different things. As u move up the keyboard, from left to right, the black notes are indicated by #, which means sharp. So, the first black note after F going up the keyboard is F#, and the next black note is G#, etc. As u move down the keyboard, from right to left, the black notes are indicated by b, which means flat. So, the last black note before B going down the keyboard is Bb, and the next black note is Ab, etc. Make sure you know your notes.
Hands and its members
When u sit down to play the keyboard, of course u are using 2 hands, Left Hand and Right Hand. On each hand there are 5 fingers. Each finger has a number (same for both hands):
Thumb = 1 Index = 2 Middle = 3 Ring = 4 Pinky = 5
Movement on the keyboard
The first movement is a half step (HS). A half step is from one key to the very next key, regardless of color or direction. Here are some examples: F to F#, F# to F, B to C, C to B, D to Eb, Eb to D, etc.
The second movement is a whole step (WS). A whole step is from one key to the very next key w/one in between, regardless of color of direction. Here are some examples: F to G, G to F, B to C#, C# to B, Db to Eb, Eb to Db, etc.
All other movement on the keyboard is a combination of half and whole steps.
Major scales
A scale is simply a group of notes that start and end on the same note. There are many, many types of scales involved in music, but the most basic scale is the major scale. The pattern for forming a major scale is:
First, pick a note. Then: _WS _ WS _ HS _ WS _ WS _ WS _ HS _
Each of these scale members also get a number from 1-7 called scale degrees. The first member is 1, the second member is 2, etc.
Chords built off scale degrees (major mode)
1 (I) / 8 = Major
2 (ii) / 9 = minor
3 (iii) / 10 = minor
4 (IV) / 11 = Major
5 (V) / 12 = Major
6 (vi) / 13 = minor
7 (vii) = diminished
4 basic types of chords
There are 4 basic types of chords that are the basis for all the chords used in music. They are major, minor, augmented, diminished. To add to the diminished chord, there is also the fully diminished chord. So really I guess u can say there are 5 basic types of chords. Forming each of these types of chords goes back to the principle of scale degrees. We use scale degrees so that it can be universal for any chord in any key.
major: 1 3 5
minor: 1 b3 5
diminshed: 1 b3 b5
*fully diminshed: 1 b3 b5 bb7 *just an extension of the regular diminished chord
augmented: 1 3 #5
Other chords
major 7th: 1 3 5 7
dominant 7th (V7): 1 3 5 b7
minor 7th: 1 b3 5 b7
6th: 1 3 5 6
9th: 1 2 3 5
11th: 1 3 5 b7 9 11
13th: 1 3 5 b7 9 11 13
*Each of these chords can also be altered by sharping (#) or flatting (b) a note(s) to form even more chords
Inversions
Look at those basic chords, what if we were to play those same chords, but switch up the order of the notes. This is where inversions come from. An inversion is just switching the order of the members of a chord. How do u invert a chord? You invert a chord by taking the first letter and moving it to the end. Depending on how many notes there are in the chord, there can be many inversions. Here they are:
3-note chords: 4-note chords: 5-note chords:
root position = x y z root position = w x y z root position = v w x y z
1st inversion = y z x 1st inversion = x y z w 1st inversion = w x y z v
2nd inversion = z x y 2nd inversion = y z w x 2nd inversion = x y z v w
3rd inversion = z w x y 3rd inversion = y z v w x
4th inversion = z v w x y
