It's all Good Ev,
Looks like you may have tackled one of the hardest to collect, Gum tree, and it looks like a nice one at that.
I was going to suggest that you should collect a couple at the moment to give you an idea of what you will be up against come spring, about the best time for collecting.
I would love to be in your shoes with this gum. Usually I might give something like this about 50/50 chance. We often say the aftercare will make the difference so being a beginner don't be too deflated if it doesn't survive.
Once it is potted up in a fairly open mix make sure it doesn't dry out. Then slowly over time ensure it doesn't stay too wet. The key to understanding this is diligent care. You will need to check the soil often. Sometimes you will need to stick your finger into the soil to see how wet it is under the surface. Imagine something like 30% water and 70% air is a healthy mix for the roots. When you do water imagine that you are using the water to flush out any old stale air. So water excessively. Then watch diligently again remembering how long it took to dry out last time.
There are other things that can be considered in after care. Misting the leaves like a cutting is often helpful or you could go as far as covering the collected material with plastic to keep the humidity up. Some times the warmth of the sun or a heat mat is very helpful but also care must be taken that it is not exposed to the elements too much.
In time when collecting you will be able to identify a tree from a hundred paces. Have fun
Oh and one thing I forgot to mention with Gums is they may take a long time to show signs of new life. You may think they are on the way to dying and then start to shoot new life so make sure you don't give up too early with this one.
It's too bad your in such a hurry cause the stories I could tell you, Bushels and baskets of stories, hole crates full of stories. But if you can spare a moment I will tell you one story.