My comment is it sounds like you have good, supportive parents that are encouraging you to be proactive in working towards your goals.
You have a young body, don't abuse it.
Work smart and safe.
Buy and use PPE, personal protective equipment, such as good boots, chaps, eye and hearing protection. Read the warning label that are packaged with most the chaps. They often show the areas most likely injured using a chain saw, and where the largest percentages of injuries are, from your toes to your head.
Fifteen years old is a great time to begin practicing good work habits.
By that I mean take the time to assess what your going to do, what are the dangers and how can you minimize them.
For example, keep your work area as clear as you can of trip hazards that can restrict or trap foot movement. Get in the habit of using your chain brake, each time before moving your feet.
Get your dad or someone to coach you on proper use and maintenance of a saw. Chain saws can be deadly. I personally know two friends who have had close friends killed while using a chain saw. One was an adult who had been drinking, the other was an eighteen year old earning money in the summer cutting pulp. He died from a kickback. (Actually the adult was not using a chain saw. He was holding the bottom of a ladder, and another person was on the ladder, topping a small tree.)
If you get tired running a piece of equipment, stop and take a break, or shift to something else less strenuous for a bit. Sharpen a chain, or clear an area of cut rounds if need be, before cutting more.
Be respectful of your body and use proper lifting techniques.
You can't be a pilot if you have a bad back, or restricted motion in crushed fingers or such.
Of course one goal is to make money, but learn to work steady and safe, not racing and cutting corners chasing a few dollars.
Ask how many guys on this forum have bad backs.
Back injuries seldom heal well, and often are life long, painful issues. Hernias can be easily repaired with surgery, but will sideline you for a couple months from any lifting, and limit physical activity for some time.
It is much more practical to work smart and safe before an injury than to begin doing so after an injury.
Listen to your inner voice if it saying something your doing might not be a good idea. Your body may be telling you something important.
Finally, use the buddy system. It is not a good idea to be running a saw in the woods or at home alone.
As for tools, plastic wedges are very handy, and a pulp hook. I got my pulp hook from Bailey's with a triangular tip. Flick your wrist to set it, not a whole arm swing, and the back edge of the triangle tip hooks as you lift (there is a back grind to it). Sometimes the tip can glance off the side of a round and graze or hit your leg. The wrist motion limits that somewhat, and again, the flat faced triangle vs a point is safer.