Bonjour
Nous avons mal aux jambes après le match de foot.
<em>QUESTION</em>
<em>Où avez-vous mal ? ► </em>Nous avons mal aux jambes.
☺☺☺
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Ne t'y va pas, restes ici means "Do not go there. Stay here. However, Ne t'en va pas, reste ici is "Do not go. Stay here" which essentially is correct as well. Up to you. They're both right in my book. If you're going to pick one, go with the first one.
I’m sorry I don’t remember most of these from when I studied French grammar but try using a grammar book or a online conjugation website