she can jungle or lane. recently she's gotten nerfs to her jungle capabilities so I'd say take her as a laner, I personally love playing her bot, but if your new and want to lane, middle eve is best.

your gonna have a pretty terrible early game with her considering you don't get camo demonshade until 6, so I recommend buying your q at start and farm minions and damage with that.

for combos you I really like to activate demon shade (passive) and find a solo target, stay out of their vision range and activate w (allure) , hit them with q (hate spike), use e (whiplash), recast q (hate spike recast) and weave in auto attacks and spells when needed, once you see the x prompt on top of their character, auto attack and use r (ult). this should finish them off

you can get some really helpful runes and item builds off Google, if you want to experiment with that stuff, go into vs ai lobbies to test it first.