You shouldn't use straight bleach initially since you want to build up around 30 ppm CYA so should start out using Dichlor initially for around a week or so and then switch over to using bleach. See Using Chlorine in a Spa for more details. This is known as the Dichlor-then-bleach method, but does not need Nature2.
If you want to minimize the amount of chlorine (which I assume is why you got Nature2 in the first place), then you would use MPS with the Nature2 according to the Owner's Manual where the MPS is used before and after the soak to maintain a proper MPS level. You will probably still need to use Dichlor around once a week to keep the water clear.
For every 10 ppm dichlor you add, you will also be adding 9 ppm CYA. So if you need 30 ppm CYA, you can add as much as 33 ppm FC as dichlor and be just fine. Once you have your CYA where you need it, switch to bleach.
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