Help me with Outlook 365

I need an ongoing relationship with an Outlook 365 consultant. I am CEO of small Private Equity firm. I have Office 365 and work on both Windows 10 PC and Mac. Have Iphone 12 Pro, Newest IPad Pro and need synching help. I use PieSync to sync contacts between Outlook and Less Annoying CRM. Having trouble searching for contacts in Outlook 365. I read something online about indexing. Very busy and want to have someone I reach when needed to resolve outlook questions. i have IT service, but want Outlook 365 expertise.