You did not say anything about training! 10k is not a long distance, not even for an overweight newbie. Aches you mentioned come from pounding because your legs aren't got used to running. 10k takes about 30min from elite and 60min from beginner so there is no need to do a massive carboload. When you eat a hour before a race food will probably flosh in your stomach. Save that 3 to 5 hours before a race and take an easy digesting snack maybe 2h before race. Next time please provide some information about training and use your own content. That photo is likely some ultrarunner's photo - not a 10k racing/training kit.