It sounds like you're pretty new to fitness. I'd suggest you take the time to read as much of the QA answers as you can. And if you have any other questions, feel free to ask as you're learning. 

Ok, to answer these questions, DHT is Dihydrotestosterone. DHT is a metabolite of testosterone. It is responsible for some of the side effects that go along with using test, such as hair loss and enlarged prostate. Some steroids are derived from DHT. These are usually used for cutting. They aren't as good for mass gains but they will not convert to estrogen and cause water retention. 

As for EQ, it isn't ideal for a first cycle and when you do run it, it sould be run with some test as your base. Looks like you're new to gear and it sounds like your diet could use some work. With the right plan, you can stay fairly tight and even get ripped using test or test and EQ. If you want to do a simple, light cycle with very low side effects, something like Anavar might be a good plan. I'll outline a plan at the bottom of this response. 

As for clen, Clen is not a steroid. It will help to create a slightly higher calorie deficit. it may help take your diet about 5% further, but it isn't going to get you ripped if your diet isn't in order. I would suggest getting the nutrition in order first and then come back here to the QA and check out the various responses I have written about clen use.