Hi Algy,
It helps if you have family there and someone that's willing to support you. Your brother will also have to fill out documents to say that he will be supporting you financially while you are there.
No you don't need to get a job before you go there, but some people take that route because some companies are willing to sponsor.
You will need your passport, some other form(s) of identification, and if you want to be able to drive around, then an International Driver's License. They are good for one year.
You will probably need a medical certificate from your doctor and if you are approved then the Belgian Embassy will stamp your passport with a 3 month stay.
Then once you get to
Belgium, you have to present yourself to City Hall, and there they will extend your Residence Permit and will give you a Work Permit.
Of course, you can always call the
Belgium Embassy. They should be able to tell you everything that you will need.
Hope this helps!