Convert PC CRM software to Mac and/or Web-Based

I have a CRM software application that runs on PC and I am wanting to convert to a Mac application that is also integrated with my I-pad. Or, the other option is to convert the PC-based software to a web-based application that I can access anywhere. The 3 devices I would be using the app from are my Macbook Pro, my I-pad and my I-phone. I work as a coach and I use the CRM to manage my client files and invoicing/cashbook. I would also need to be able to drag Word documents that are e-mailed to me and drop them into a client folder on the app. The system doesn't currently do this, so this would need to be an added feature. I'm not techie, so not sure how complex this conversion is.