Which connection you take really depends on how long it takes to clear customs/immigration. And that's a very hard question to answer.
If your flight lands at 6.30 am, you'll be one of the first planes in. Customs/immigration opens at 6.30 am; so if your flight is early, you'll be waiting on the tarmac until that time comes round before they open the door to the air bridge.
Once you get out of the plane, everyone will walk in one direction towards customs/immigration. You'll be processed for entry into the US there.
At that time of morning, there is usually flights from Melbourne, Sydney and Brisbane arriving. I think there are flights from Asia as well. So, if your plane is a little delayed, there might be a queue for immigration. If you end up queueing with people arriving from China or from South America, be prepared for a longer wait.
If you're travelling with small children, you might be lucky. Someone in the arrival hall may notice and ask you to get out of line to a shorter queue. Follow their instructions immediately!
Once you come out of immigration, you'll head towards picking up your bags. Again, it depends on which flights have come in ahead of you as to whether the baggage handlers are on the case straight away or not.
After picking up your bags, you'll clear customs. From memory, there might be sniffer dogs around and/or you'll need to get your bags screened.
For internal transfers, there should be ground staff that will direct you to where you go. From what I can see, you'll be transferring terminals. I can't remember if there is somewhere for you to re-check in your bags at the International Terminal if you have your bags checked all the way through to MCO. I *think* so; but it's been a while since I've travelled all the way through. Some of the other ANZACS will know for sure.
When you get to MCO, there won't be the same scrutiny. You will be travelling on what is effectively an internal flight. You just pick up your bags and go. No immigration nor customs if you've cleared them at LAX.
Hope this helps.