Business information needed

Dear all

My name is Anas and i'm living in France,

We are looking to create an invoicing entity on Mauritus to benefit/take advantage of the double Tax treaties with African countries

Could you help me with the some questions ?

What kind of visas should I request for business and should i apply it online or should i do it after arriving ?

Open a bank account for a company - documentation needed and wich bank is recumended from you to transfare the money from Africa to mauritius then to france ?

How many days we need  to create a company, is there any person that i contact with to make it fastest that i can ? and what are the papers that i need to open it  and how much does it cost me ?
what does it takes to start a business there ?

thanks for all for your time
Best Regards
Anas Al Attar