Where can I see the "Do's and Don'ts" like not bringing backpacks, etc?

Timberwolves also have an app "know before you go" section

The Target Center website on restrictions and requirements

Try googling Target center rules, brings you right to the site.

They will stop you if you try to bring one in.

Do

Look on their website, no backpack, purse only billfold and they do not take cash only cards