Advice needed

Hi there,

I have a few questions, but in order to ask them properly I need to do some explaining first! Please bear with me!

Firstly, my fiancée and I are living at home, both working full time. We purchased a block of land (10 acres) last year that we intend to build on in about 5 years time when we want to start a family.

Our intentions were to keep living at home for another year or so, and pay off as much of that loan as possible (we have an offset account, with an interest only loan – don't worry, we are very diligent and make sure that we are saving at a bare minimum as much as we would be repaying with a normal principal and interest loan!). In around 6 months we planned to buy a property (unit, etc) that we would rent out for 11 months, then move into (to get the FHOG).

We would live there for a few years, and then build on and move to our property, and keep the unit as an IP. We aren't particularly risky people, so I can't see us ever having a lot of IP's, but one or two would be a happy medium I believe.

My questions are:

1. If we were to agist stock on out land and obviously make a loss (payment for agisting would be far less than our interest repayments), would we be able to claim our interest in our tax?
2. If we rent out the unit before we live in it, will we be able to claim it as our PPOR when we move in?
3. If so, when we build and move into our new house, do we have six years to sell our unit before we have to pay capital gains? Or would our new house automatically become our PPOR and we would have to pay capital gains when selling our unit?
4. Does this seem like a reasonable plan, or is there a better option than buying a unit?

Thanks for your time – I hope that all made sense!