I would say it's like
Mithalwen said. If you wish to read in the "proper course", I would suggest Silmarillion, and Unfinished Tales only after you have read the rest (Hob+LotR+Silm). Children of Húrin is merely another way of reading the story which takes one chapter in the Silmarillion (but very nice, I would say). Perhaps you might try stop at Silmarillion after chapter 20 and instead of the short version of the story, read Children of Húrin and then return back and continue in the tale of Silmarillion

What else... well, the Hobbit may seem a little childish to you after HoME - speaking for myself, it does not bother me, but I know there are people who don't like Hobbit because they consider it too child-ish. But I would try it at least.
In any case, it's nice that you may continue "chronologically" in the tale of Middle-Earth

Many people don't read it like that.