In order to be able to lead your reader in the direction you want to go, you will have to use strong transitions in your writing. You can do that in several ways: by using entire sentences to connect one thought to another, entire paragraphs to give more background information, or simply a word or two to indicate your intentions.
This list of signals is from The New Reading Teacher's Book of Lists, 1985 Prentice-Hall, Inc., Englewood Cliffs, NJ 07632. By E. Fry, D. Fountoukidis, and J. Polk.
1. Continuation Signals (Warning—there are more ideas to come):