Ok, now it's time to learn about some blocks and resources! maybe i'll teach you how to build a thing or two! Ok, so you cant really do this in survival, but, once you spawn in your creative world go to the three dots and click on them. Then, you notice there are categories on the left side. Click on the sword. Here you will find all the tracks, buckets, minecarts, and weapons. There are different things sorted out in different categories. Now, go to the sword category and get powered rail, rail, and lava. click the x and put 4 powered rails down in a row next, put the lava 2 blocks away. Put plain rail on the end of each side of the powered rail track. You have the lava rail!