The most important thing about playing bass pedals is making sure you are seated correctly, and this will be determined on whether you play spinet type or full pedalboard type.

The videos Ian has posted links to are of a Spinet pedalboard, and if you are using this type pay great attention to how he is seated and positioned.

Find a few videos of organ players (Of all types) to really see how it is done.

Simple steps to get started:

1. A pedalboard is nothing more than an oversized keyboard, and so everything you have learnt still applies.

2. For starters, play the pedal note that matches the root note of the chord you are playing so as to get a feel of the sound.

3. Look to play the root and fifth note of the chord you are using to give you a nice alternating bass line.

4. For variation don’t hold the pedal down for the whole bar, play the pedals as 4 ¼ notes (If in 4/4 time) so that you are driving the rhythm along. (Move on to mixing all the rest of the note lengths to add variation)

5. Walk up and down the bass pedals, which main seem difficult at first, but so long as the bass note you play is in the chord that you are playing it will sound fine.

The above are a few suggestions to get you started, how deep you want to go is entirely up to you.

Hope this helps

Bill