Well, we know that progestins generally lower libido, and neither of these are progestins so thats a good start.

Side effects from halodrol should be minimal. Find the side effects of turinabol and assume you may experience those

It is effective in its own way. Turinabol is used to gain mass over a preiodof time and wont cause the sudden gains like Superdrol did

It is entirely your decision as to whether you use extra supps or not. You might be able to skip on the Milk Thistle though, because turinabol (and I asume halodrol) is quite easy on the liver