Bert,
I am doing consulting in Belgium,
in general as a consultant you are selling a service , that service is yourself , you need to define what are the unique skills, experience you have that makes you special , the more special you are, the higher your day rate will be.
so the key is to develop your skills.
if you want to do startups i would advise you this belgian startup coaching program http://www.iminds.be/en/entrepreneurship/training-coaching/b...
Fil