Just to answer you questions..
1. You really need the live rock in the tank to get a good cycle IMO. Without putting the rock in now you run the risk of creating mini cycles as you add rock down the line which would only further delay adding fish.
2. IMO no need to switch out 100% of the water you made up with Tap, just gradually replace it with RO like you mentioned.
If you want criticism, I would say forget about even a dwarf lion in a 29G unless that is the only fish you plan on having. I admit, a Fu Manchu lion by itself would still be an interesting tank. They are a difficult lion though and not recommended as a beginner fish. For a beginner, it is very hard to have only 1 fish and be satisfied early on. I would look into more community fish than a predator fish for a 29G tank.
1. You really need the live rock in the tank to get a good cycle IMO. Without putting the rock in now you run the risk of creating mini cycles as you add rock down the line which would only further delay adding fish.
2. IMO no need to switch out 100% of the water you made up with Tap, just gradually replace it with RO like you mentioned.
If you want criticism, I would say forget about even a dwarf lion in a 29G unless that is the only fish you plan on having. I admit, a Fu Manchu lion by itself would still be an interesting tank. They are a difficult lion though and not recommended as a beginner fish. For a beginner, it is very hard to have only 1 fish and be satisfied early on. I would look into more community fish than a predator fish for a 29G tank.