Hey mate, nifty scar. If you are serious about enduro here are some really good tips to get your there. Let's be real it does cost money so not a lot of choice you need to work and budget. You are 18 so understand the work whole not a lot of money situation. Figure out what you want, how much, maintenence costs etc. Make sure leave enough for fun stuff . If you have goals something to aim at.
Get fit. Get a good program together to get over this injury and to toughen yourself up. Enduro is one of the most physical sports there is, and the less experienced the harder it is. That's why some of us old farts go so well, we know the shortcuts which you will learn.
Budget in some coaching, technique is critical and the secret to going fast. It costs money , not necessarily a lot, but it is a shortcut and so early on avoids learning bad habits which are hard to unlearn. I hate to say the M word but motocross coaching is best to start with then offroad. Forget the bling and go fast stuff for your bike, coaching will make you faster and better quicker.
Buy the best gear you can afford, secondhand is cheap these days but buy a new helmet, as you know coming off can really hurt.....
Notice I haven't mentioned a bike yet. If you really only want to tool around ignore the first 4 paragraphs, well maybe para 4 is a bit important. But if you are half serious the first 4 will get you there.
Others might disagree but as a coach you should start with a 2 banger. To start with you can buy an older relatively competitive bike around your budget. A 200 or 150 is best, then a 250 second choice. A 2st is best because it will teach you how to ride properly. A smaller bike has to be right gear right time and teaches you clutch, or your coach will hammer you. A 2 stroke is easy to work on and will teach you maintenance. There is literally nothing you can't do on a 2 stroke with average tools at home. Buy some tools each pay day.
Learn maintenance, saves you money and it's nice fixing ever one else's bike on the trail.
Oh yeah, have fun. There is not much better fun than roosting all your mates as opposed to being roosted...