Which itr should be filed

1) If you are having  source of Income  only  commission  or  main  Business  Income   then  ITR 3  . 

2)  ITR1  is for  Income  from Salary , House property , and  Income form other source  less than 50 lac  . So your commission  income  is  secondary  income  then ITR 1 . you can show in  Income from other source . 

please confirm from other also .