Sounds like all is going well. 10ppm is good at this stage. Ammonia is still not at detectable levels (or dodgy test kit haha). Are you seeing any brown diatoms on your sand now? This is the next stage, as you may start to see the diatoms and possibly a brown algea appear. This will last for a few weeks. Adding Ammonia, agree with Mr Soggy, you can add a little to simulate fish in the tank. Reefgrrl produced a daily video of a typical cycle. Is interesting to see (just remember each tank is slightly different)
Regarding what to do next. Think of the fish stock. Here is a "stocking strategy"
Also I would start to educate yourself on the basics of salinity, Alk, calcium and Magnesium.
All the best. Sent from Singapore Reef Club mobile app