There are a few situations in which a multitool comes in super handy, and in most of those situations it’s nearly the only thing that’ll save you time and/or effort. But as a general tool, your better off getting other things first.
My advice for your situation would be a jigsaw. My “power tool journey” from standard home improvement into beginner woodworker so far has been:
Electric Drill
Hammer drill (houses around here are concrete mostly)