I want to switch over from /Quickbooks. Is there a step by step way or process to do that? I have been using Quickbooks for many years and have quite a few existing customer accounts.
No, there is no step by step process. Read the Guides and set up a test business to familiarize yourself with Manager’s features before trying to enter actual data. Pay attention to the Guides about batch operations. Look at both the new Guides, which are a work in progress, and the legacy Guides. Come back to the forum when you have specific questions and illustrate any problems you are having with screen shots.
Will do
In addition to the advice by @Tut also search the forum as there have been similar topics about this and more importantly do not expect Manager to behave and be similar to Quickbooks. Over time you will appreciate it as an excellent accounting application in its own right.