Gidday mate
.
1. Your plan will probably mean NZ tax department declares you resident for tax purposes and you'll pay tax on income derived from property rental and job in Dubai.
2. Like the others say, planning to get a job just for 6 months doesn't sound realistic.
3. How are you going to manage your property if you're not here?
4. Capital Gain is not a certainty. There's a risk of property prices falling in the next couple of years. Especially for apartments.
5. Coming here for a visit first is a good idea.