Looks like a Sword.
Plant the roots into the substrate (rocks or sand) If it tries to float away you can add a rock over the top to the side of the plant where most of the roots are (under the substrate). For this plant push it into the substrate a couple millimeters from where the root and the plant start.
Look into getting some root tabs for this kind of plant because they are substrate feeders. Swords love the ferts to grow well. They will need appx. 6-8 hours of light if you have a standard stock light fixture.
You can break your light period for a couple hours off in the middle of the day, if you like the lights on am and pm. If you leave the lights on for 12 hours, all at once you will likely get algae. You can use a timer if it is more convenient.
Congratulations on starting your planted tank!!