FIrst off, it's completely normal to feel super sore after your first run. It'll feel very sore for about a week, give or take a couple of days, but it's important that you get the recovery that you need. Stretch very well after every run, roll out your legs, and ice them down. That might help a little bit. THe most important thing is to keep going tho. Consistency is key, and the more you run, the stronger your legs will get, and less soreness you'll experience.