Have read the thread on hard gainers and that lead me to the conclusion I needed to be eating more, so recently (last month or so) I have increased my intake.
This is good - keep going! Have been hitting the gym for about 4 years or more; 3 or 4 times a week. I am there from an hour to 1.5 hr. In this time my stomach has flattened out and I've become leaner and cut.
Excellent! It seems like a catch 22, need more muscle for a base to build muscle on, but how do I get the first layer of muscle??
You lean how to eat properly. I have a good start, but have been told that in order to build muscle at my age I needed to increase my test. to 500mg/week.
Thats nonsense. You do NOT require 500mg/wk of exogenous testosterone to build mucsle. I dont know who told you that So I did and have seen gains, was recommended to add the mast. , which I did and have noted a difference with it. Haven't noticed any sides others say are associated with high e2 levels like high BP, gyno, water retention, etc.;
just a lowered labido.
<-- That's an E2 side. Thus my purchase of the arimidex.
Good call.
As for diet, after I first read the article about nutrition for hard gainers I added carbs which I'd been staying away from prior. I admit I do feel better since increasing my carb intake. My intake consists of 200 grams of protein a day, 50 of which are in the form of a protein shake right after the gym. I eat carbs an hour before the gym and a granola bar about 30 minutes into my workout. According to a myfitness pal, my TDEE is about 2500 calories/day.
We'll figure this out at the end.
My diet consists of whole eggs, whole wheat bread, tuna, boiled chicken, grilled pork, oven fried chicken, vegetables and some fruit, and a handful of supplements twice a day. I eat 6x/day and this includes the food prior to the gym and the protein shake and carbs right after the gym. I'm not sure if this is enough information about my diet, as I do not keep a log of my daily intake.
You're going to have to put an effort in to logging your macros with an online macro counter so that we can help you properly. We need your macros to assist you in developing the proper diet. I have some standard diets saved up so i may be able to start you off in the right direction anyway. 
Only once in my life was I above 160# and that is when I was over 180# and couldn't see my feet cause my gut was in the way. Sure don't want that again. As for injuries and working out, I have golfers elbow in both elbows that flare up. I don't push near the wt. I see others doing in the gym and here is another catch 22; I've read you have to increase the wt. to build muscle. I cannot seem to do this as my joints won't take it.