Annie's short range makes laning challenging, but her easy CC and burst ultimate make her a powerful presence in teamfights.
Mitigate her short range by taking Phase Rush and building utility items like Malignance, Cryptbloom, and Rylai's for better survivability and team contribution.
Be mindful of the Flash-Ult bug (flash, then a slight delay before ultimate), and use Hextech Rocketbelt to remove Banshee's/Edge of Night before casting Tibbers.