Hill repeats are a great way to build strength and endurance! As a beginner, start with shorter repeats (200-400m) and a moderate incline (around 4-6%). You can always increase the distance and incline as you get more comfortable. I like to jog back down to recover, it helps me keep my heart rate up and gets me ready for the next repeat. Also, focus on proper form and try to maintain a consistent pace throughout the repeat. Good luck and have fun!
Been there, done that! I had to modify my training, reduced mileage and intensity. Also, orthotics and proper footwear helped me.
Hang in there, you'll get through this!