I don't know about mangaging, but taking over the Belgium national team is a good challenge. I would do it myself, but I would prefer to manage a French club built around French and Belgian players than the national team itself. It's much more rewarding. But, I would suggest the following for it:
I, personally, would play a 4-5-1 or a 4-2-3-1. You have the players for it. Defour, Witsel and Co. can provide a good combined midfield and support Hazard and Lukaku quite nicely. You have a strong defence in Vertonghen, van Buyten and Kompany to rely on when things get tough and could play a counter-attacking strategy to see-fit. Hazard can play just off Lukaku as an Inside Forward, and Lukaku can be a Poacher, Advanced Forward or Deep-Lying Forward.
Take your pick.
I am in a rush, so I may come back to this when I have time. But this is just off the top of my head.