okay, I think I see a few of the questions you're asking from a different perspective since I am also a n00b to the chemical portion of the game and have spent an insane amount of time reading, while still being very experienced with the ("natural") iron.
First off, ED = every day. EOD = every other day. E3D = every 3rd day, etc.
The reason people are throwing up red flags left and right is because you used the "g" word, gyno. No one is busting your chops, understand that the peeps on this board actually give a shit about new bros, and they don't want a new bro growing a set of jugs due to lack of good advice. If you've had gyno prior to ever using steroids, that means you are almost definitely prone to it, and from your cycle, you will grow a nice set of titties. Hence the recommendations to use low amounts every other day of the sustanon only. That way
a) you don't have to worry about dbol bloat and boobies
b) you don't have to worry about greatly varying levels of testosterone in your system, along with the associated bloat and boobies
c) you won't have to worry about shopping for bras.
sustanon isn't "king", per se, it is just "fancy". It has 4 different esters of test which will cause a more varied supply of testosterone to your system than, say, cyp or enanthate. Injecting sus EOD (Every other day) will mean that you will have a relatively consistent amount of the faster-acting esters in your body at any given time as well as slowly building up a supply of the longer esters, which means your overall testosterone level changes will probably be far more gradual, which means that you will probably have less side affects since sides are associated with drastic t-level changes, not just overall dose.
as for using EQ or not using EQ, you will, if you peruse a series of boards, generally find a 50/50 split. Some think test + deca/EQ is a wonderful first cycle, others think test alone is just fine. You won't know how it will work for yourself until you try. There is much to be said, however, for the idea of "use 1 item so you know EXACTLY how you respond to it". and since 99.99999% of all (knowledgeable) bros use test as a base, pretty good idea to understand how your body will react to it.
and, until you have FULL KNOWLEDGE AND UNDERSTANDING of PCT and how to prevent gyno, from meds to doses to timing, then you need to avoid doing ANY type of cycle.
that is, unless, you want to spend your evenings fondling your *own* tits instead of your g/f's.
As for me and my mostly worthless opinion, at the age of 23, I was a walking erection as it was, and had no problems at all following a ridiculous workout plan and making great gains from it, I shudder to think what would've happened if I added over 1g of hormone into my body at that time.
Ask yourself this question...can you do barbell rows with excellent form? and by that, I mean, can you smoke your lats with just set after set of barbell rows? or will your lower back and arms and shoulders get trashed while your lats are still waiting for work?
What about squats? Is your squat technique down perfect, or do your hips float around at the bottom? Do your knees buckle inward as you come out of the hole? Does your ass tend to come up faster than your shoulders, necessitating a half-good-morning/half-squat approx 2/3 of the way up?
Can you deadlift properly? Meaning, your hips are low, your shoulders square, and your lower back curvature maintained without rounding, even when you are at your limit? Do you heave the weight or is it a strong, solid, steady pull with straight arms?
What about your bench? Do you have a strength deficit on one side as you get tired? Do you find yourself lifting one of your legs near the end of a set and twisting a bit to one side because of a flexibility/coordination/strength deficit between your dominant and non-dominant side?
If you don't already have significant weight lifting experience (no offense, but you probably don't unless you started very young and learned from someone very wise) and you don't already know how to eat for both muscular growth and bodyfat loss, then you probably should learn before you waste the most productive steroid cycle you'll ever do. The growth potential of your first cycle is optimal. Would be pretty cool if you had optimal exercise technique and and dietary knowledge as well, otherwise, it's like putting 87 octane into a Ferrari.
I mean, it'll work, and it'll still be pretty good, but...why bother?