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Introductions to boogie-woogie songs vary widely. A very common way to start a boogie-woogie is by simply playing the left hand bass pattern for four measure by itself, and then introduce the right hand.Another common way to begin a boogie-woogie is by using the first two chords of a turnaround progression, the I7 and I dim 7. In the key of C this means C7 and C diminished 7. An intro of this sort is usually four measures in duration and consists of going back and forth between these two chords. These four measures count as the first four measures of the 12-bar form and when the left hand comes in with the bass pattern it is on the IV chord. Use an intro to start and an ending to finish and now you're playing boogie woogie!
Learn an introduction. Combine a repeating, rhythmic bass pattern in the left hand with chords and licks in the right hand.