From Totally Inexperienced to Trekking the OT

As the title suggests we are what most of you would call inexperienced hikers but like a lot of people we want to do the Overland Track.
It will be just myself 44yo Male and my son 17yo, we enjoy day walks and have done a few overnight hikes but to go from where we are now to doing the OT we need to get a lot more experience.
So my question to the experienced hikers is how would you go about preparing or more accurately training to do the OT if you were just starting out again?
A few things we possibly already have going for us is that we are Tasmanians so we are aware of the potential conditions although my son needs to get some more experience in the highlands to truly know what cold is, we are keen campers so camping out is something we have spent many nights doing and we are both reasonably fit although both of us need to be better match fit as far as hiking with our packs etc.
Ill list how we are going about our preparations so far and hopefully we can get some advice on how we should change it or perhaps we are on the right track...so to speak
It has only come from a dream to a discussion and a decision of "lets do it then" to now the first stages of preparation. So at these early stages we are watching as many videos and reading as many books as we can about the OT and we are confident we will be well prepared as far as having the right equipment and pack weights so what we really need to do is 'train' by doing the right hikes leading up to our departure date, which at this stage is not decided.
So we are thinking we need to do as many overnight and multi day hikes as we can and make sure we climb some decent altitude in varying conditions. And to be blunt, besides our equipment preparation we are at a loss as to anything else we should be doing to get ready?? LOL
So any help or advice will be appreciated??
It will be just myself 44yo Male and my son 17yo, we enjoy day walks and have done a few overnight hikes but to go from where we are now to doing the OT we need to get a lot more experience.
So my question to the experienced hikers is how would you go about preparing or more accurately training to do the OT if you were just starting out again?
A few things we possibly already have going for us is that we are Tasmanians so we are aware of the potential conditions although my son needs to get some more experience in the highlands to truly know what cold is, we are keen campers so camping out is something we have spent many nights doing and we are both reasonably fit although both of us need to be better match fit as far as hiking with our packs etc.
Ill list how we are going about our preparations so far and hopefully we can get some advice on how we should change it or perhaps we are on the right track...so to speak

It has only come from a dream to a discussion and a decision of "lets do it then" to now the first stages of preparation. So at these early stages we are watching as many videos and reading as many books as we can about the OT and we are confident we will be well prepared as far as having the right equipment and pack weights so what we really need to do is 'train' by doing the right hikes leading up to our departure date, which at this stage is not decided.
So we are thinking we need to do as many overnight and multi day hikes as we can and make sure we climb some decent altitude in varying conditions. And to be blunt, besides our equipment preparation we are at a loss as to anything else we should be doing to get ready?? LOL
So any help or advice will be appreciated??