Which itr from to be used for ay 2017-18

I Have income from two sources,  one inthe form of salary from my educational  institute and the other in the form of fee for professional or technical serivce from a private ltd. company. I have TDS  by my institute under  section192 and from the othe compamany under section 194J. I want to know which ITR form I need to be used for filing the returs ITR1 or ITR 4S?.  how  much of the income in full or partial from professional fee can I show for tax computation .

Incase if I have to use ITR 4S,  what is the code I need to use for schedule BP.i.e.  like 0703 - consultanancy service  etc.. 

thanks in advace