Dear if you are confusing this much go to air port immigration office take the Application form from there you will find all information by the this is very clear for visit visa you need only passport copies + document which shows relation like marriage certificate show that she is your wife , birth certificate show that you are the father of that kid 3rd thing better take your salary certificate because i dont know what is writen on your ID card about profession. That all nothing else required.
I brought around 7 members of my family on 1 month visit.
One thing more if you need extendable visa you should go to Immigaration office in MAdina Khalifa or just for one month you get from airport it self.