I would listen to it a couple times, here's a good recording:
https://www.youtube.com/watch?v=OeVsTsX8hmQ
His overall interpretation of everything seems to be good. After that, it's pretty straightforward, just watch all of the articulations, such as the stacatti and slurs, and it does lack dynamics in some places so don't be afraid to make a musical decision and add them in places, and make sure to do a lot with dynamics. Feel free to have fun with it, and be sure to give it some good interpretation and style. Other than that, just watch breathing, and then make sure to work with your accompanist (if you have one) to figure out what you need to conduct for them (especially mvt. 2), and to get it together, especially the 3rd movement. And don't shy away from the high C's, even if you do have braces!
And I don't know of anywhere to get it free, sorry. But it should be at a reasonable price on Hickey's or J.W. Pepper.
Hope this helps, good luck, it's definitely a fun piece to play!