Few Doubts: Applying for Singapore Citizenship

I am a Malaysian and a Singapore Permanent Resident since mid 1991. I am a shareholder of a Malaysian company and she is still operating. I have a trading company running in Singapore but no relationship (only supplier and buyer) with company in Malaysia.

I decided to apply for Singapore Citizenship and I would like to know:
1. Must I transfer or give up my shares in Malaysian company?
2. Must I declare my shares to Singapore government? (I have not received any dividend for many years).  If so, which department shall I declare to?
3. Must I declare my property which given by my deceased parents to Singapore government? I have no receive any income from that property.

Thank you very much.

1. Must I transfer or give up my shares in Malaysian company? 
No need

2. Must I declare my shares to Singapore government?
Yes

If so, which department shall I declare to?
Go to their website

3. Must I declare my property which given by my deceased parents to Singapore government? I have not received any income from that property.
Is it a house with no occupants? It is still a taxable property under Singapore tax laws.