Kgirl, do you mean the resistance settings on your trainer? Same principle applies - start at a level that perhaps provides some challenge but at which you still feel comfortable. If later you do OK with upping the resistance, that's great. If not, you're still getting great benefit from your indoor work, as riding a trainer is definitely tougher and more intense than riding outdoors where at least periodically you can coast the downs and spin the flats.

OK, I'm off to an outdoor ride now - too pretty out there today to sit here!