how often do you get your hair cut? (correct)

I go to the hair salon once a month. (good)
I like to my hair permed or dyed. (good)
Sometimes my hair has problems. (good)
So I get a hair cut haircut for my hair's health maybe once a every 6 months. (good)
When I go to the hair salon, the staff gives me a tea. and I explain the hair style
I want to the staff. A and he they cuts my hair.
Then he sets makes my hair look good. Lastly, I pay for my haircut. (Okay, this is messy. Let's break this down).

1) When I go to the hair salon, the staff gives me tea. (This is equivalent to saying: The staff gives me tea when I go to the hair salon. Here there is no comma. Since you preceded with the end clause first, you need a comma to separate them. Its a "cause and effect" sentence. The cause: When I go to the hair salon. The effect: the staff gives me tea. You going to the hair salon causes them to give you tea. So 'Cause', 'Effect' or 'Effect Cause'. Pretty simple to remember.

2) I explain the hair style I want to them. (It is a complete sentence so it's fine. Since you already mentioned 'staff' before, you should not continue referring to them as 'staff' but instead refer to them as 'them'.)

3) They cut my hair. (Fine as well. 'They' is used and not 'he' because use used the word 'staff' which is plural. If you used 'staff member' then 'he' can be used here.)

4) They make my hair look good. (Should never start a sentence with 'then'. Some writers will use it in novels, but rules don't always apply there. For any other writing such as: technical papers, essays, and so on; you don't use 'then'.)

5) Lastly, I pay for my haircut. (Good. You just need the comma there.)

I would say: When I go to the hair salon, the staff gives me tea. I explain the hair style I want to them and they cut it for me. In the end, my hair looks good and I pay for my haircut.

how often do you get your hair cut?

I go to the hair salon once a month
I like to get my hair permed or dyed
Sometimes my hair has problems.
So I get a hair cut for my hair's health maybe once aevery 6 months.
When I go to the hair salon the staff gives me a tea and I explain the hair style
I want to the staff. And he cuts my hair (When I go to the hair salon/stylist the staff gives me tea, and I explain the type of hair style I want to them.)
Then he sets my hair to look good. lastly I pay for my haircut.(Then the stylists sets my hair to look good, and lastly I pay for my haircut.)

Nice Job!

how often do you get your hair cut?

I go to the hair salon once a month.
I like to have my hair permed or dyed. 
Sometimes my hair has problems. 
I get a hair cut for my hair's health maybe once a month.
When I go the hair salon the staff gives me tea, I explain the hair style
I want from the staff, and he cuts my hair.
Then he makes my hair look good. Lastly, I pay for my haircut.