-How can I find out I'm doing the things well?
The main parameters I look at are energy level, digestion, sleep quality, mood, motivation, temp/pulse, blood pressure, achilles tendon reflex, time comfortably spent between meals, resiliency to stress, and sex drive. These are all associated with high metabolism and youthfulness.
-What marks I have to look up to know if my T3 is high
Temp/pulse, Achilles tendon reflex, Basal Metabolic Rate test, blood pressure differential.
-What marks I have to look up to know if a meal is good balanced?
Energy, concentration, mood following meals. Temp/pulse after meals.
-What marks I have to look up if I have high cortisol/adrenaline or TRH?
Temp and pulse shouldn't drop after meals ever. This will show you if adrenaline and cortisol are high. If temp/pulse drops after exercise, this will provide further feedback as to how to regulate that activity. Will also provide insight into your resiliency to stress.
-What marks I have to look up to know if my progesterone are being increased?
I think the above will provide you with feedback. Lab tests indicating high or low cholesterol indicate low steroid synthesis. There are also needs to be thought regarding estrogen detoxification, lowering of endotoxin, regular elimination, production of bile salts from cholesterol, and nourishing the liver and thyroid (since the thyroid activates liver metabolism). Can't treat the gut the gut like a waste dump, digestible protein must be in the diet and PUFA as low as possible as PUFA poison proteoloytic enzymes (and respiratory enzymes).
-What marks I have to look up to know if my CO2 is high?
Basal Metabolic Rate test would provide some data, but temperature and pulse will provide insight b/c oxidative metabolism produces ATP and CO2. When the metabolism is high it equates to more CO2. Mouth breathing and excessive exercise can lead to massive losses of CO2 and poor oxygenation of tissues which means less CO2 and more lactic acid. Moving to high altitude will ensure higher CO2 concentrations.