It is always best to stagger your total dose of tramadol; it favourizes metabolism to the active metabolite O-desmethyltramadol.
It is also worth it to note that you should no0t exceed 400mg of tramadol as that is the commonly accepted threshold at which there is risk of seizure.
Third, if you are not experienced with even one of these drugs, let alone both, you should use them separately before combining, but I suppose it is a little late now.