What % of hands should I be playing on the button? Llsnl/ live mtt

It depends

It depends on your playing style, table image, stack sizes and too many factors.
but usually you should try to balance your play with value hands and bluff hands, it means that there is no problem you if you want to play with Q7o on button.

I feel like this question is a bit similar to your small blind opening question. Poker is not this simple. I could give you a decent range of exactly what hands to open from the button. If you don't play well from that point on in the hand this knowledge isn't worth much and won't make you a winner.

That said, you're trying to learn. I think you should get out there and try some and learn from that. As a beginner a good piece of advice is to maybe play a little bit too tight early on. You aren't well equipped to make money from the marginal hands anyway.

Open all of your pairs, all of your ace highs, half of your king highs (I leave it to you to pick which king highs are in the top 50%), and then anything else that is a 19 or higher in blackjack. This isn't a good strategy long term, but you would be getting involved from the button with hands that will make money and should give you situations you can handle while you learn.