I think this approach is fine. I must say having been doing this for years, treating hundreds and thousands of men I have been underwhelmed with the results with topicals. Injections can cause peaks and valley and I have many younger men inject twice a week that smooths out the peaks and valleys. I think it is appropriate to follow the advice of your primary doctor and endocrinologist. I have just seen too many men spend months or years with gels with sub optimal results. Many men are diagnosed with depression and are not really depressed (I have no idea if this applies to you), but the presumed depression is base dupon low T.
My recommendation would be to pursue this but if a few months pass and results are modest consider another approach. Pellets are one approach to have smooth levels of T and are placed every 4 months.
The second step was to start the exercises, since I was more than half way to achieving my goal, this was more fun than I thought. I started off slow and increased as my fitness levels got better. I now exercise three days a week using mainly the exercises in Mike's book, I also do a little strength training like pull ups and tricep extensions just to boost my muscular strength. I have been doing so for only two months and have had great results, I have not got a six pack stomach as yet, but my stomach is flat and I am so confident that it is only a matter of short time since all the hard work has been achieved to get rid of the bulge I once called a stomach.