Overwatch

Can I hack on competitive without getting overwatched on an unranked account? I am going to solo que.

You cannot get overwatched on any non-competitive game mode. However you can still get VAC banned and all that. However if you receive too many reports on a casual game, then it's possible your account can be flagged so that the next competitive game you play will be sent as an overwatch case. So I recommended playing your first comp game without hacks.

So if I play my first game legit and rage hack 1 game every 24 hours I will be fine?

NO only hack in other gamemodes if you get a report on compatitive you WILL get overwatched
and surly don't hack your first compatitive match!