Selling websites and creative services

I didn’t know where else to post this in the forum so I thought here would be best.

Does anyone have a link to an article or blog post about selling your web services to a client? Almost like a walk through of how to properly approach clients and what stages it should go in. For example - talking about the problems a client has - to the solution you can provide… I think you know what I mean. I just want to sound more intelligent/professional when talking with clients.

I have came across articles in the past (forgot where they are now) but would love to read up a little more.