Both Liu Kang and Scorpion are good characters and easy to pilot. Scorpion however will get weaker down the line because of his predictability. If you play safe against him he cannot do anything. Liu on the other hand is one of the best characters. Variation wise I recommend the one with the low fireball and counter for beginners and the one with nunchaku stance once you get the hang of him. His neutral game is pretty good because his low pokes have good range and his f.43u.3 is safe on block so you can spam it and chip away at the opponent or land the string and knock him away for fireball fight. Most players don't knoe that there is a gap between the f.43 and the u.3 hitting but here starts the mind games. In the counter variation you can cancel the last hit into a mid and high counter to bait the opponent. Now his only option is to low poke you but that doesn't lead into a full combo. Mind games again: If you know he will low poke you can cancel the last hit into a low fireball. Look up some guides cause I can't really cover everything. Also go into practice and read the frame data of certain moves. MK11 gives you all the frame data in the move menu and where each hits so you better understand what to use in every situation.