Honestly be careful -- if I were you I would try the gel/cream first and if it works with tolerable side effects, then go for butt pellets, because once you do you're stuck with them for 3-4 months.
I did TRT for a little under a few years, first with the gel which upped my values and showed *some* improvement in energy and sex drive initially, then quickly diminished despite the higher T value. So they then tried the pellets, and even though they didn't push my values much higher than the gel, my skin turned to total fucking shit, and shot my rage/paranoia level through the roof. Even now, it's been over a year since taking any supplemental Testosterone, and my skin hasn't entirely returned to normal. The treatment basically appears to at least have semi-permanently changed the level of oil my skin gives off and changed the texture of my beard hair.
imho modofinal/vyvanse turned out better for energy/focus, and testosterone never really helped my sex drive much anyways.