The guiding principle is to avoid twisting the chassis by raising any one corner dramatically more than others during the process. Most newer leveling systems are designed to facilitate this. As a general rule, get the front well-planted first, especially if it is a single jack in front. Most systems are designed to allow the front to pivot a bit on the front jacks while the actual side-to-side leveling is done with the rear jacks. Techniques may vary with the make and type of the leveling system, though, so please tell us what you have on your coach.
If you watch an automatic leveling system in operation, you will see that it first gets all the jacks firmly in contact with the ground and them incrementally raises each one on the low side(s) a modest amount until it achieves level. Making changes in moderate increments avoids stressing the chassis in any one direction.