I'd like to develop a simple online system that should be accessible by me and few of my colleagues too where we could maintain a list of our existing customers and book visits for them (as opposed to let them book the visits). What I have in my mind is some sort of "private website" with a login process that would only allow selected users. The website should have access to a database too, so that users could register new customers, book them for visits, see the calendar for a given day, etc.
Which type of service would you suggest for this? I am not a web developer, so I'd love something relatively fast and simple to set up. Also I don't mind going for paid services, but only if they are relatively cheap. This is not an actual professional service, but more of a "side job".
I thought of something like weebly, wix and similar, but I don't know whether it's going to be easy to do the database bit, and authentication.
Any suggestion would be very appreciated. Thank you!!