Thug life and kittens.
Hi there! You’re really pretty btw. For professional modeling (not hobby modeling, alt modeling, etc), the first thing you need is an agency. Some agencies are more focused on fashion, some more on commercial, and some more on talent (acting), so you need to know what you want to do as a model. I usually focus on agencies that are fashion/commercial. Start applying to agencies either online or in person if they have open casting calls. You don’t need pictures or anything, if they like your look and agree to work with you, they’ll take some snapshots and start from there.
Only thing you need to be careful of are scam agencies. If ANY agency asks you for money upfront, they are not legit. Look at their website and their models, how professional does it look? Of course agencies charge you for certain things but they will DEDUCT that cost from jobs you do after they agree to work with you. I could recommend some agencies to you based on your location (If I’m familiar with your area)
If you have any more questions or need any help along the way, feel free to ask at any time =)