O365 and Shared Drive Setup

I have Microsoft Office and Office 365 setup badly on 3 PC's sharing the same account and a shared drive i want you to setup properly for two different users, sharing the same online drive. There are also multiple email addresses and i want these setup properly on the PCs and a phone... (Budget: €250 - €750 EUR, Jobs: Installation, Microsoft, Microsoft Access, Microsoft Exchange, Microsoft Office, Microsoft Outlook, Microsoft Word, Office 365)