How to learn to think ahead?

I always can only see my next move, i wish i could plan more ahead. Any advice?

Firebrand is correct. it all starts in chess puzzles

Try playing daily correspondence games right here on chess.com. The reason I say that is you will have more time to plan ahead. You will have at least a day to play through countless variations until you decide which course of action is best.

In the opening. following the opening principles. 

Control the center

Develop minor pieces toward the center

Castle

Connect your rooks.

Always ask yourself 3 questions when deciding on a move:

1. Are my pieces safe?

2. Do i have any captures

3. Can my opponent capture any of my pieces?

The middlegame is where you develop a middlegame plan.  A simple middlegame idea is:

Scan your opponents 5th, and 6th ranks (3rd, and 4th, if they are white), and look for weak squares, weak pawns.  Squares and pawns that cannot be defended by another pawn.  Weak squares, and pawns closer to the center are better targets to attack. 

Look for Forcing Moves - forcing moves are checks, captures, threats.  Look at all Forcing Moves (even the bad ones) and calculate out as far as you can. 

Nice summary I Am Second.  But for all us rookies could you bridge the gap between those pointers and how that leads to the ability to envision more then one move ahead please.

Your game plan begins with the middlegame.  Firstly, you make sure your pieces are safe.  Then you look for forcing moves - checks, captures, threats.  You look at each one, and calculate them out as far as you can (even the bad lines).  This will help you get in the habit of looking at the entire board. 

As you get better at this, your pattern recognition improves.  Repeating this is just like any other habit.  You will get faster, and faster at it, and you will begin to see patterns.  As you start yo recognixe patterns, you know what to do, and wont have to spend as much time calculating. 

As far as looking more than one move ahead?  Again...Start with Forcing Moves, and calculate out each line as far as you can.  If there are no Forcing Moves? Look for your least active piece, and place it on a more active square.  Piece activity is the name of the game.  Keeping that in mind makes the game much easier to figure out. 

Dont overthink this game.  Unless youre a IM, or GM there is no need to feel you have to see 10 moves ahead.  You only need to change your game plan when one of two things happens:

Piece exchange

Pawn structure changes

When either of these two things happens - start over with your game plan.