I am retired military,draw retirement,disability,social security,a little W-2 work&1099-Misc work supervising/consulting. Do not own a "Business"...how do I file?

I do not own a "Business" have a "Business License" or a "Business Checking Account".  Just do W-2 and 1099-Misc work when people call.  In my 1099-Misc total amount includes hourly pay, per diem, meals & incidentals.  What amount do I taxes on?  Do I pay any tax on per diem and M/IE if I don't spent it all?