General practitioners are normally not the best way to go. Granted, every now and then you can find one that has decent steroid knowledge but it can be hard. I'm also generally NOT a fan of endos for low t plans. A lot of them, at least from what I've seen, are good with many types of hormone plans but really lacking in this type of treatment. The best bet is to find a doctor who has taken the time to learn about and understand steroids for this purpose. There are some good clinics out there. I'd imagine this sites lowtestosterone.com deal would be a good bet too.
If you're on permanent TRT you won't need a PCT plan. PCT is for when you come off cycle and are going to stay off cycle for an extended period of time. If you're on true long lasting TRT you won't be coming off.
As for other medications, many can get by without anti-estrogens on TRT without any fear of gyno. Supraphysiological doses of test are far more apt at promoting possible estrogenic side effects. However, imbalances in hormone levels are still possible and low amounts of anti-estrogens are needed such as a low dose of arimidex. This is why finding a good doc is important.