not done many 10k's but did a few half marathons in my younger days. Here's my strategy:
Start off at a relatively relaxed pace – something you know you can do/close to your target time – until at least halfway. The warriors that go off too fast will soon be being crushed beneath your feet and that gives you a boost anyway. Eeven if you feel great, resist the temptation to up the pace too soon. At half way re-evaluate your split vs your target and adjust accordingly based on where you are and how you feel. But resist temptation to go mad even if you feel good and have time to make up. Aim to make a bit back over the 3rd quarter without going to hard; you can't set a PB at this point but you can screw yourself up.
My strategy was always to get to the 4th quarter (10 miles for me, 7-8K market for you) close to target and with enough in reserve that at this point you can really start to push hard. It'll soon be over, that gives a lift, you'll be passing dozens of others which gives you a lift, and you can take the pain for 10 more minutes at that point.
Nutrition for 10K? TBH just eat well the night before, and you shouldn't need any more than natural reserves for events under 2 hours.