Outside salesperson (as defined by the DLSE) :
Any person, 18 years of age or older, who customarily and regularly works more than half the working time away from the employer's place of business selling tangible or intangible items or obtaining orders or contracts for products, services, or use of facilities
http://www.dir.ca.gov/dlse/Glossary....%20salesperson
Are you considered inside or outside sales (based on the definition above)?
From what I can find, California requires most employers to pay at least 2 times per month. http://www.dir.ca.gov/dlse/FAQ_Paydays.htm However, "outside salesmen" don't show up in the chart on that page.
As to the retroactiveness, it might depend on the language of the compensation plan documents. Does it address at all what happens if the plan expires and no new plan is in place?
All I can suggest is calling the DLSE or filing a wage claim.

