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SEO is also a way for you to marketing your business

there are 2 benefit:
Advertise your site to everyone
Get effective backlinks of your web

I think you should call for a professional website company for help. Because there are many oppinion around this toppic and you will not able to choose one.

I am considering that if I would have trouble with my domain, how do I solve with this? Because there are many company providing domain in my country.

I think Article submission is the most important factor that helps you raise PR. You create articles and send them to authority webs and forums as many as you can

As I know, Linux is more difficult to manage than Window so that Window is better

you should search on Google with the keyword is domain, hosting, the first result is your partner. They are active to attact customers

cloud hosting is lower than vps or server, you only have to pay for amount brandwith you used. It will help you reduce cost and staff.