When it's your move, what do you consider? (teaching my kid chess)

I'm trying to help my child learn how play chess. I'm not the best person to be teaching them, however. What do you look at when it's your move? What should they consider on each move? 

Thank you in advance.

Whenever I'm getting ready to make a move I ask myself "what will annoy my opponent the most"

1st What is my opponent planning? What pieces or pawns is he attacking?

2nd What is my plan? What am I attacking?

3rd Who's plan or attack is better or quicker? If it's mine go ahead with it. If it's his what can I do to thwart it.

Some Heisman tips

In slow games, your goal each move is usually to find the best move, and the principal way you do this is to be careful each move to:

1. Identify all the things your opponent could do to you if you would “pass” – his threats;
2. Identify your candidate (reasonable) moves;
3. Analyze what would likely happen after (all) your candidate moves (considering your opponent will try to play his best move, of course);
4. Evaluate the resulting positions, compare them, and choose the move that leads to the position that you feel is the best for you.

Get yourself a copy of Heisman's A Guide to Chess Improvement: The Best of Novice Nook

I tend to analyze backwards. I ask myself "what sort of position would I like to reach?", and then ask myself "How do I reach that position?"... in effect, instead of trying to map out a route forward to an uncertain goal, I fix on a goal and try to map out the route back from that goal to my present position.

Basic threats. Hanging pieces. Forks, pins, skewers. Board vision. The absolute ABC stuff. 

If they’re just learning and are young there’s absolutely no chance of them being able to assess and evaluate/compare different plans or ideas. 

If they’re especially young (less than about 8) then just focus on having fun and don’t worry too much about improving.

Here's how i think during a game

1. How is my opponent playing vs. me?

2. What is a counter-move i can apply in response to my opponents move?

3. What blunders have i made/my opponent made?

4.What is happening on the entire board?

5. What threat of seen checkmate can i block?

6. Since i can't get checkmate, how do i manage to stir the game towards a stalemate? 

(This only applies to those who know the basics of chess. if not, teach the basics and then this.)

for no.5 the word between threat and seen checkmate is or. its a typo

!!!

also, teach them to not make bad moves and find advantages against their opponents

If I could tell a kid one thing on that topic it'd be this:

After I find a move I like, I imagine it as if it's been made on the board, and I look for all the reasons I might dislike the move. I look for moves by my opponent that will make my intended move look as bad as possible.

If I still like my intended move after that, then I let myself play it.

(this is essentially the same as people recommending threats, hanging pieces, blunder checking, etc, but I used different language because it's sort of a life lesson that extends outside of chess too )

I suggest for you to let him read a couple of simple chess book. My suggestion would be the book 'Simple Chess'.

By Stean?

It's a good book, but for a beginner? For a child? I'm not so sure...

Yes it's an extremely simple book.

Yeah, I've read it, it's a good book.

Kids are... I don't know how to say it... not very smart (depending on the age of course).

I'm not a coach much less a coach for kids, but I'd just think something concrete like simple tactic puzzles would be best to start with.

Like JamesColeman says, simple tactics, board vision, the ABC stuff.

My son often forgets to take into account his opponent's moves, plus he doesn't generate several or more candidate moves, nor does he calculate and evaluate his opponent's moves when deciding.  He plays the first thing he sees, and plays way too fast.  

Solving tactics puzzles is one thing.  Developing a good thought process for online or OTB games is a different beast altogether.

That's true, but also I think one of the main benefits of solving tactic puzzles is they help develop a few good habits. Alone they aren't enough for a few reasons IMO, but a few useful habits you'll gain are looking for forcing moves, and calculating multiple variations to see which one is best.

On top of this, I think it's hard for a beginner (especially a kid) to appreciate some vague positional concepts. With tactics, the solution is concrete, you forcibly win pieces or checkmate, and the answer to "why not this other move" is immediate an unequivocal.