Many people start with PLA. Ngen is also a good newer choice that is easy to print and stronger than PLA. I personally started with ABS, which smells funny and is prone to warping, but makes for really strong parts. One thing to keep in mind if you want to try different fillaments is that they melt at different temperatures. if you try ABS which wants 240c, and then switch to PLA that wants a much lower temperature, unless you purge all of the ABS, you can appear to have a blocked nozzle. Make sure you heat the nozzle up to whatever the higher temperature material would need and extrude 40-50mm worth of plastic, then drop down to the print temperature needed for the lower temperature material.
When printing PLA, fan is a requirement to be on, otherwise things will look melty, but it will stick to the bed easier. For ABS, you want no fan to start (you use some fan for small layers and bridging operations, but you can ignore those until you print a few things and get the hang of things) but will be prone to lifting off the bed.
Your first dozen prints should all be calibration objects. Print the bed calibration pattern, a couple calibration cubes, a Benchy boat, etc. Look up calibration on www.thingiverse.com and you should get a bunch to try. Once you can print those decently, you are ready to move on to printing those super complex neat toys you bought a printer to make.