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Trigger, staying in the
Trigger, staying in the 10-ring at 25-feet with iron sights is indeed a good place to start. If you haven't already, google the basics of marksmanship and ensure you're doing three things:
1. Focus on front sight; let rear sight and target blur.
2. Controlled breathing; squeezing trigger with breath held.
3. Slow and steady trigger squeeze; the gun's discharge should be a surprise.
Depending on ammo choice I bet you'll be able to stay in the X-ring next time.
After that you may want to look into shooting positions, use of a sling, and ammo choice, depending on how interested/ambitious you may be.
What make/model rifle do you have?