Need itr assitance for nill without salary slip

Hi..!

I want to submit fill ITR with NILL .. As my total income is less then 2 LAC...

I have not any salary slip... my employer pay me cash without any deduction...

Should I have need to salary slip for submitting ITR. Or only declaration is enough.....

And Is any other document is required .... for filling ITR online...

And which ITR have to fill ITR1 or any other...
 

Thanks