my pb for 5k is 28:15 and ive been running for 7 years and run 4 times a week including parkruns so think the 25 mins mentioned above could be a bit ambitious.However you will definately get quicker with regular running.What made the most difference for me is running up and down hills and intervals
I have some Mizuno Wave Inspires 10 for road running and some Adidas Kanadias 4 for off road.Adidas much smaller and narrower,take 7.5 in Mizunos and 8 in Adidas.
Mizunos quite wide fitting which suit my wide feet !!
Had to make 3 little vertical slits in padded ankle bit of right shoe as they seemed to be cut quite high which was rubbing my right malleolus.100% fine now,10s a great shoe.Look forward to wearing the 11s when price come down!