1. For the company contact information, as well as the visiting and postal address, are those the same as my personal information?
Yes! You can simply use your residential address & details unless you have an actual office ;-)
2. What should I put as my company name?
Entirely up to you! Some people just use their own name, while others make it something funny.
3. Should I register as a proxy?
This does not apply since you're the only person in your company.
4. When should I put my start date as?
That is your own decision. It is advisable to start sooner rather than later, so an earlier start date is usually better.