I have written some sentence and need correction and I want a person who can help me to do these sentence to sound more turkish

1.We must go now because we have much to do at home.

-Gitmeliyiz þimdi çünkü çok þeylerimiz evde var.

Þimdi gitmeliyiz çünkü evde yapacak çok iþimiz/þeyimiz var

2.Instead for to walk to the school, you can take the car.

-Yürümektense okula, araba alabilirsin.

Okula yürüyerek gitmek yerine, arabayla gidebilirsin. 

3.When she take the key, she can run to the school.

-O anahtarý alýnca, okula koþabiliyor.

or

-O anahtarý alarken, okula koþabiliyor.

Which one of them is right?

I dont really understand your sentence ? 

But maybe you mean: Ýf and not when, but

still its a strange sentence.

If she takes the key, she can run to school.

Anahtarý alýrsa, okula koþabilecek.

4.He must be here now, oh, he will break my heart again.

-O þimdi burda olmalý, aman, o kalbim kýracak/koparacak yinede.

O þimdi burada olmalý, aman, kalbimi tekrar/yine kýracak. 

But it is also strange sentence because of he must be here now...

maybe you were meaning he must be here now any moment or

arrive any moment or something ?

5. If I was you, I wouldn´t take her to my home.

-Senin yerinde olsam, o evime almayacaktým.( not sure )

Senin yerinde olsaydým, onu evime almazdým.

1.We must go now because we have much to do at home.

-Gitmeliyiz þimdi çünkü çok þeylerimiz evde var.

Oh here I mean:

- Gitmeliyiz þimdi çünkü çok þeylerimiz yapmak var

I have written some sentence and need correction and I want a person who can help me to do these sentence to sound more turkish

1.We must go now because we have much to do at home.

-Gitmeliyiz þimdi çünkü çok þeylerimiz evde var.

2.Instead for to walk to the school, you can take the car.

-Yürümektense okula, araba alabilirsin.

3.When she take the key, she can run to the school.

-O anahtarý alýnca, okula koþabiliyor.

or

-O anahtarý alarken, okula koþabiliyor.

Which one of them is right?

4.He must be here now, oh, he will break my heart again.

-O þimdi burda olmalý, aman, o kalbim kýracak/koparacak yinede.

5. If I was you, I wouldn´t take her to my home.

-Senin yerinde olsam, o evime almayacaktým.( not sure )

1.We must go now because we have much to do at home.

ÞÝmdi gitmeliyiz çünkü evde yapacak bir sürü iþimiz var

2.Instead for to walk to the school, you can take the car

Okula yürümek yerine arabayý alabilirsin or Okula yürüyerek gitmektense arabayý alýp gidebilirsin  

3.When she take the key, she can run to the school.

4.He must be here now, oh, he will break my heart again.

Onun þimdi burada olmasý gerekiyor ,oh ,tekrar kalbimi kýracak.

5. If I was you, I wouldn´t take her to my home.

Senin yerinde olsaydým,onu evime almazdým.

some of your sentences in english are not correct gramatically and they need correction too if you want me to correct them i can do it  for you