Welcome to BB; sorry it was not under better circumstances. You sound like a typical married man trying to figure out what went wrong. I and a lot of others on this forum know what you are going through; you are not alone.
"It was quite the shock as I thought everything was going Great."
This is more common than you might think. A lot of men enter a marriage with low to no expectations; that in itself creates a problem if your wife is expecting the happily ever after ending.
"I feel hard done by as I’ve had no chance to better myself."
There may be more to the story. There is no gain in bettering yourself if you wife is not willing to do the same.
"I will be moving out in a month or 2 slowly So that it’s not a huge shock to everyone".
Unless you have a good reason to move out, I would stay put until you get the benefit of some legal advice. There is no law that says you have to move out; after all, it is your house also. You can legally separate under the one roof if you want too.
"my biggest thing is that I feel like I need to see my kids every minute"
Another good reason not to move out.
"How do you over come these feelings of sadness, How do you move on?"
With great difficulty. You might want to consider a few session with a phycologist. I didn't find them particularly helpful, but some people do; worth a try.
If you visit your GP, s/he will organise 10 Medicare subsidised visits to a phycologist. If you want something less formal, you can talk to a counsellor at "Relationships Australia" over the phone.
You have options; but please get legal advice before you do anything rash. You are entering a brave, sad new world.