Kia ora f Cook and welcome
This is a huge question and the answer depends on a whole lot of things and the following list is what you will need to find out to be able to progress further with your desire to return home to live.
Is the land just a block without a trust or similar running it or is it part of a larger block or trust?
How many owners are there - do you know them all?
can your home remain there for the use of your immediate family i.e. children, grandchildren, great grandchildren indefinitely?
Probably not as they are not the only owners of the block. Maori land is SHARED land and communal so you can not effectively claim a patch as yours and your decendants for the rest of time. By doing this you would be cutting out all the other whanau who whakapapa to that block.
Setting up Papakainga can be a huge expense, with the legal fees and subdivisions and picky councils and bureaucrats that expect $1000 just to drive to the whenua look at if for 5 minutes and drive off. This is why trusts usually set up Papa Kainga and set the rules as to who can live there, lease fees, how long people can they live there. These are often called LTO's or License To Occupy - again the right to Occupy the land but not have it for your descendants for all time.
Also, The Ture Whenua act which governs all of this is currently under review so it could all change and be another ball game!
That review is supposedly out at the end of the year - there is a post in the Papa Panui under Current Events that talks about this.
So what can you do in the meantime? Make sure you know what kind of block it is, if it is part of a bigger block, who it is administered by and under what act, who are the trustees for administering the block and who are the shareholders!
You will need to know that to do anything!
Nau te raurau,
Naku te raurau,
Ka ora ai nga tangata!
Together we will get there!