I am obviously not Xen Nova and since you have not solicited advice from anyone else feel free to tell me to piss up a rope if need be.
I am going to suggest that if you are interested in EDT that you purchase one of Charles Staleyâ??s products, he is the creator of the system. He has an excellent reputation. Several of his manuals are available in e-book form (download a pdf. ) The T-Nation store has two such manuals available for download, though I have never purchased an E-book from this site so you may want to contact a mod about payment (Mods maybe jump in if it helps). Staley's basic text on EDT is Muscle Logic, you may be able to get it from an online or local bookstore in Holland. I cannot give direction as to which product would be best for your needs and I have very limited experience with EDT personally. I tried it for a short while, several weeks, and thought it was great. I ran into resource issues at the gym though, since you are in essence taking up twice as much equipment and the time factor means working in with others is a no go.
Xen Nova also mentioned 5/3/1 by Jim Wendler. This is an excellent minimalist program that many people have great success with. It is outstanding, structured, and best of all is very forgiving of variation in how much time or energy you can give any one workout. With your work and teaching schedule, this factor alone makes it seem like a good fit to me. His manual is available as an electronic download from elitefts.com. The manual is very well written and easy to understand. I recommend it.
The reason I am suggesting that you get your hands on a written manual, especially 5/3/1, is to answer the questions that you are asking and the ones you will inevitably have as you follow the program. A good manual does this. With language possibly being an issue, although you are to be commended for your English, I think it will be even more of a benefit for you to be able to read and re read.
Link to T-Nation store with the manuals
Amazon link to Muscle Logic (us site, you can at least use the ISBN listing to find a source)
EliteFTS 5/3/1 manual
Hope this helps, and I am not trying to speak for Xen or anyone else on this board.