First put plastic over the bamboo mat, so the rice doesn't stick to the mat and is easy to clean for more rolls.
Take a nori sheet (toasted seaweed) and break it in half, than place it on The mat With the shiny side facing down. Than grab a handful of prepared sushi rice and spread it. it should be 1 cm high.
Than put toppings on, line up the salmon on one spot of the roll than the avocado on top in a line.
Than you can roll it up with the plastic wrap, you can also roll it With the bamboo mat and the plastic wrap at the same time.
Than you can cut them and eat enjoy!