What type of shoes should I get with regular pedals I have never been more than a casual rider, maybe 5 miles at a time. I signed up for a 500 mile multi-day bike event that i need to train for and was thinking about getting real bike shoes due to more energy transfer to the pedals. I just have regular simple platform pedals now. so would it even make sense to get special shoes with hard soles if I don't have regular pedals?

Thanks!
I like downhill larger platform pedals with what is commonly referred to as street shoes.
I don' like advertising a brand but an example is the best answer.
All Mountain Flats

You have people advising clipless (spd) and I don't agree.  Ironically clipless means the ski boot type clip in.  But I don't agree with spd.  I would do a 500 mile multi day ride on some big platform downhill pedals with the little spike and some and some nice street shoes.  There is enough traction to hold your foot in position.  You can move your foot around a little bit to change how you hit muscles.  I will ride an uphill is a little different foot position.  When you get off you can walk around and loosen up you legs.  You don't have to carry another pair of shoes or sandals.  Now a one day 100 mile ride - then I would ride spd.