Baitcasters can be tricky to master (for lack of a better word), your spool/magnetic adjustment should probably be set a bit on the tighter side while learning to cast (and save you hours of bicking-out bird nests. Work on just casting, then loosen the spool a bit here and there, and feather it with your thumb. After you learn distance, set a paper plate, coffee can, whatever in your yard and practice accuracy at different distances, all of the previous done from a standing position. Once you get fairly accurate, start all over setting in a chair. Stick with a pistol-grip type rod, so you don't have a lot of butt-end to work around. Practice overhead and side-arm (both directions) casts.
ETA: Also, be sure you aren't using a lure heavier than your rod was designed for, it could cause your inaccuracy problems, or at least add to them.