The frequency of injections depends on the concentration of the oil and the ester used. For example, if you are wanting to do 500mg/week and you're using test enanthate or cypionate, you could do a shot on sunday/wed, mon/thurs, etc. This will help to stabilize your blood levels. The half life of those esters is roughly 14 days.
If you choose a short ester such as Test Propionate, then a more frequent dosing is required. I don't recommend this on your first test run, because it would require every day or every other day injections.
If you're trying to bulk, use the test alone. No need for Hdrol. IMO that's a compound better suited for a cutting cycle or the tail end of a longer cycle. It has relatively low sides which Im sure you're aware of, since you stated that you LOVE hdrol. A lot of us make the decision to run more than one compound at once, but Easy is right, you benefit from running test alone the first time to know what the sides are.
If you are estrogen sensitive, you may experience bloat, water retention... Along with elevated blood pressure.. Gyno symptoms are small lumps forming under your nipples, and if your nipples become puffy for more than a few days or start becoming tender or itchy, then dosing an AI would be recommended.
About AIs. Many to choose from. You can use something topical like Formastanzol, a topical version of Formestane, which is a suicidal aromatase inhibitor, but it will drop your estrogen levels super low if you don't really need to use it. Letrozole, Exemestane, and Anastrozole are all other options that you can use. Read up on dosing, sides, and half lives of each of those compounds and make sure you feel educated enough to choose one. IMO it's not wise to dose an AI unless you have estrogen sides because it can hinder your gains, dry out your joints, and have an adverse effect on your lipid values.
HCG. Human Chorionic Gonadtropin is a woman's hormone that is used to keep your testicles from experiencing atrophy. It is basically mimicking LH production, while your body's endogenous LH production is shut down and you can use it to ease into PCT on longer cycles. If you run more than one compound I STRONGLY recommend using it and you can begin dosing 250iu x 2 weekly starting two weeks after your first test injection.
Start PCT with your SERM of choice 2 weeks after your last test injection, allowing the ester to fully clear your system. Some OTC supplements may be effective enough on certain individuals, but I like to have a SERM on hand just in case. Remember that serms can be hepatoxic, so taking supports for your liver is recommended during the cycle and PCT. Although test is not considered hepatoxic for the most part, it does have the capability to be so with higher doses or even depending on the individual. Or perhaps if you do have a "kickstart" with a methylated oral compound, that would be a situation where you would want to use liver supports.
I always advocate cholesterol supports during cycles because your lipids take a lot longer to recover then your liver values do. Lowering your HDL and increasing your blood pressure builds plaque in your arteries, causing damage to your cardiovascular system. Omega fatty acids with a higher amount of 3 over 6 or 9 is recommened, along with red yeast rice to promote higher HDL and lower LDL. If you supplement with RYR, however, it depletes levels of Coq10, which is a very powerful antioxidant which is beneficial to the heart. So basically, they are best when supplemented alongside eachother. This may become expensive.
It seems like you are gonna run a test cycle, or maybe a kickstarted cycle.. Which is good. Leave the deca out this time around, as it's opening a whole different can of worms. Progestin sides can be difficult to control, and once you experience them they are troublesome and harder to get rid of then estrogen sides. Tren and Deca are infamous for causing temporary impotence, along with prolactin gyno, which could have you lactating (and traditional AIs wont do ANYTHING for this).
Over the counter supps. You may or not want to use a caffeinated preworkout powder, depending on how your blood pressure is during the cycle. To control bp the easiest, increase your water intake to reduce water retention. Creatine is good on cycle, helps your muscles hold water during heavy, strenous workouts and I never come off of it. My kidney values are fine. Enjoy eating more meat and more protein shakes, as being on AAS increases your body's protein synthesis. You can use supplements like GEAR to get the most of your protein intake.. GEAR is a MAP protein which is basically broken down and amplified to make it more bioavailable to assist recovery. Other supplements like Need2slin, a nutrient partitioner can be used to help shuttle carbs and proteins to your muscles and basically make the most out of your meals and complex carbs. Some people take it to justify cheat meals, but I don't believe in that. It basically just makes your body more insulin sensitive, which makes you less prone to fat gain and makes it easier for your muscles to receive the nutrients they need.
If you have any other questions, feel free to PM me. I hope my post helps. Best of luck and don't forget to send me a message with the link to your log, should you choose to log your cycle. I'll definitely sub.