ok here are the combos

lv 1. AA Q AA]

lv 2. Q W AA

lv 3. W E Q

lv 3. E W Q

lv 3. (most confident) W Q E

lv 6. (for engage) W R E Q

lv 6 (most damage) Q R E W

lv 6 (crowd control) E R W Q

early game is where lb can snowball her lead, she can lane bully very hard and it is very easy to pick up kills o lb. in lane, you should try to bully you're laner so that by lv 6 you can first back lost chapter with the gold from kills and cs. then you can roam and get more kills.

once you have ludens complete, you can W the caster minions and instakill them. then you can roam and pick up kills or take important objectives. she is best in 2v2's or 1v1's because of her single target damage.

late game is where lb struggles the most, as all assassins do. the best you can do is cause a distraction and blow up the adc. make sure to get zhonyas so you can't get focused so easily.

This is the end of my mini guide, I hope you begin to play LB! note that is isn't an advanced guide and for people just starting to play LB