Hi Manab
WEll, you can come on a business visa or a tourist visa which will be transformed to business once you are registered at the Board of Investment. Now for medicals, you have to repeat X-Ray and HIV, right? You can do this at any clinic and then submit all reports to the Board of Investment.
Other documents you would need: passport photos, birth certificate (original or certified copy), diplomas/certificate( original or certified copy), contract of employment from your employer, medicals (off course)... and the fees to be paid by the employer to the Government of Mauritius.
If you are coming with dependents (family, children), bear in mind that they will request a bank guarantee of Rs20,000 for each of them. Probably your employer will ask you to cater for this.