Is there parking close to the arena? If so how far is the walk? The parking garage said it was full when we went to order for the event we purchased.

Uber is the easiest choice.

If you grab a meal at Zudar's on Platt they'll usually let you park in their lot. Bit of a walk, but paying for good food beats paying for parking.

I suggest just using UBER drop you off at curbside and you're done

Yes, lots but availability depends on how early you arrive and construction in the area. I normally just Uber there.