Where to read about Workflow and working with services?

Question

SOAP

Good day.
I have never worked with workflow before, so I needed to create a process in Visual Studio that sequentially performs functions from various services: let's say Ser3 and Ser4.
The output of one function is the input to another, for example

string a = client3.Binaryze("some string");
client4.Model b = client4.Process(a);

Tell me, where can I read about it? Google gives out a lot of things about workflow, but not enough that I need.
PS It would not be bad if during the process the user could open the file (to enter), well, or enter its name.
PPS and still get through to System.Drawing.Image, if at all possible.

Answer 1

Andrew Troelsen - Pro C# 5.0 and the .NET 4.5 Framework, 6th edition
Chapter 26. Introduction to Windows Workflow Foundation