How do I do a back walkover and handstand forward roll?

i can do many things in gymnastics like a backbend, bridge, side and front splits, handstand, head stand, cart wheel round off and more but i want to really know is how to do a back walkover and handstand forward roll. because these are my targets to reach level 1 so i can start ma next stage. i seriously want that medal for lvl 1 achievers. pplz help!!!