How much hiking is required to see the falls? How far is that from the parking?

There is a huge waterfall literally one minute down the trail it is the most impressive waterfall there and require zero exertion of energy to get to

The parking from the entrance isnt that far of a walk. Depending on what falls you want to see depends on how much you want to hike. There are maps outside the entrance that let you know information about the 3 basic trails. The Red trail is the longest and covers pretty much every waterfall, but is only suggested for avid hikers. The trails over lap a lot so you can always make your own little route. The biggest and most photogentic falls are right at the start, you really cant miss them.

There are 4 trails. Green, yellow, blue and red. Green trail - 15 min hike. Yellow - 45 min, blue - 1.5 hrs and Red - 2.5 hrs. If you r not a professional hiker, recommendation is to try the yellow one. Parking is very nearby.

Minimum hiking for the main falls, but if you want to see more and explore the more advanced trails there are some hills and stairs.

Not far at all. A few minutes from the parking lot to the entrance and to the trail. I'd say 5 to 10 minutes walking depending on how far.