Good qustions 82dab and the answers are right here at your fingertips. Our forums have a cycle log section and I suggest you complete one once you have mapped out a cycle, there members can help you fine tune it. Also,a cycle log is most resourceful since the log may be used as a "Cycle diary" where entries can be added based on your results or cycle changes.
So browse the "Steroid Cycles" folder located in the forums to get a fundimental understanding of cycling. You will also fine a "Over 40" folder withn the forums that has plenty of TRT info- we always welcome feedback in any/all of our forums. Then map out your cycle on a cycle log and go from there. There are many resources here on MG along with very knowlegable members within the community that are more then willing to offer advice.
FYI- There would be no real advantage changing oils since eth & cyp are very simular.