Fine a clear plastic bottle slightly smaller diameter than that pot/cup/whatever, and cut the bottom off. Place it over the cutting as humidity dome. This will help keep your cutting from drying out too fast. Mist with a spray bottle of water routinely.
In selecting cuttings you want a node or two at the very least in the soil line, and don't keep the soil soggy. Too wet and the tree will think it doesn't need roots.
There's ALLOT to know about cuttings, and you can use the search function here or Google to start learning.
I'm trying my first maple cuttings now; tartaran maple. People say that maple cuttings root easily, but can take a long time. Be patient. Like months, or until you're absolutely sure the stem is dead.
For many species, getting 30% of them to root at all can be a big success. If this round doesn't work out, try, try again.