Your best bet would be to first ensure that you're in excellent shape. I don't just mean working out and running but also try and play some football wherever you live. Be it flag football or preferably a semi-pro/amateur team in your area. If those options are not available to you then look into playing some basketball and/or handball as you'll be running back and forth often (which will help getting you in shape or better shape), and they contain a lot of the good footwork movements you're going to need for the pros.
Whatever it is you're able to do, it wouldn't hurt to brush up on your football knowledge so in addition to the skill set you'll begin to develop, you will also develop your football IQ which is an important aspect in separating yourself from the pack as well.
As time goes on you're going to want to check out some Combine's which you can easily find online, and then go about that process as going to a Combine is the best way you're going to get noticed I believe.
I know this was two months ago but I came across it so hopefully it helps you and whoever else happens to read this.
Cheers, and remember to always strive for your dreams, anything is possible if you're willing to put forth the work.
As time goes on you're going to want to check out some Combine's which you can easily find online, and then go about that process as going to a Combine is the best way you're going to get noticed I believe.
I know this was two months ago but I came across it so hopefully it helps you and whoever else happens to read this.
Cheers, and remember to always strive for your dreams, anything is possible if you're willing to put forth the work.