What is the best build for mounted archer with magic (divination school) starting fromg 1lvl fighter? (i know it maybe weird)

I have air genasi 1lvl fighter with STR 12 AG 19 CON 14 INT 14 WIS 10 CHA 7

how can i build mounted archer/caster (divination) from it? it maybe not effective, but i’m in search of best options just in this condition. Thanks for help!