Opening realestate firm guidence and tips

Dear all,

I need your guidance. I want to start real-estate office in rwp/isd as a long term profession. My questions are followings if dealers can guide me and give me tips to avoid inconvenient. I have three preferred societies to work with dha, bahria and b-17 multi group.

1. Should i register my fir with government.
2. What are the pros & cons of registration.
3. Or i can work without registration and what are the pros and cons for not registration firm.

Keeping in view that i can do 2 numbri so need honest advice that would make my life easy.

Thanks in advance.