I also agree with Daryl. I was trained as an Army Field Medic . None of that training included stitches. In fact, I would bet that if you did stitch up a wound, any decent doctor would cut out those stitches if you subsequently went to get it checked out. He'd have no way of knowing if the wound had been properly cleaned and debred or what other damage may exist below. There are several layers of tissue that could be damaged and could need stitches to heal properly.
Personally, I would purchase some compression bandages, gauze, and medical tape. Also, take a good first aid class so you don't screw things up worse. People can cause damage when they think they are helping. Here's my favorite example. If someone is choking on food and making coughing sounds, don't do a thing! If they are coughing that means air is getting in and out. If you hit them on the back ( a common home remedy ) you stand a good chance of lodging the food deeper in the airway and eliminating their breathing. Then you'd have a real emergency and better hope you know the Heimlich manuver and can apply it effectively. Most people who are coughing are able to dislodge the food by themselves.
Good for you for wanting to be prepared! Although I hope you may never need to use the supplies on yourself, maybe someday you can help someone else!
"Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it."
~ Mark Twain