Not quite sure where to start

Hi, new to the whole mtb thing, basically discovered I had flat feet a few months ago (I'm 41 !!) and that my knees (or rather quads etc) were wrecked, no power/muscle there at all, so, need to build up all my leg muscles - have been out on my Trek6300 past 3 months and love it, but a post on here caught my eye about pedals etc and the fact that clipless ones pull up, which should help my hamstring strength....so, being an absolute noob, can someone recommend a set of pedals and shoes that would fit on my bike, and I then promise to post details of all my embarrasing falls when I forget I have to 'unclip' :-)
Thanks
Thanks
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those pedal should be fine,
what type of shoes are you after..... do you need them to be waterproof and warm or do you just want cheap ones?
Thanks for the response so far