The best option for you, considering your lack of knowledge on the subject would be to simply record some pan automation(turn L or R as you desire, while recording), then edit the keyframes manually to iron out any mistakes.
Record track automation
While playing a session, you can record adjustments you make to track
volume, pan, and effect settings, creating a mix that dynamically
evolves over time. Adobe Audition automatically converts your
adjustments into track envelopes, which you can edit with precision.
With an external controller such as the Mackie Control, you can adjust
multiple settings simultaneously. See Control surface support.
1. In the Main panel, position the current-time indicator where you want to start recording automation.
2. Choose an option from the Track Automation Mode menu.
3. To start recording automation, start playback. As audio plays, adjust track or effect settings in the Editor, Mixer, or Effects Rack
4. To stop recording automation, stop playback.
If recorded keyframes are too numerous or irregular, see Optimize
Track Automation Mode options
In the Editor panel or Mixer, you can choose one of the following
modes for each track:
Ignores track envelopes during playback and mixdown, but continues to
display envelopes so you can manually add or adjust keyframes.
Applies track envelopes during playback and mixdown, but doesn’t
record any changes you make to them. (You can preview such changes,
but keyframes return to recorded settings.)
When playback starts, overwrites existing keyframes with current
settings. Continues to record new settings until playback stops.
Begins recording keyframes when you first adjust a setting, and
continues to record new settings until playback stops.
Similar to Latch, but gradually returns settings to previously
recorded values when you stop adjusting them. Use Touch to overwrite
specific sections of automation while leaving others intact.
(Automation controls are located on the track controls, where it says "Read" in a dropdown box)
Instructions taken from Automating mixes with envelopes; an Adobe Audition Help page.