Spouse Reunification Visa

Myself and my wife are relocating from South Africa to Belgium. I have Belgium citizenship/Belgium national, my wife don't have. Should I as a Belgium need to prove for stable, regular and sufficient means of subsistence, while applying for spouse reunification visa?
1. How long do I need to work before we can apply for my spouse reunification visa ?
2. If I open an business, how long before we can apply for my spouse reunification visa?

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