People are always asking for advice on here, and a lot of what is being asked has no basis on how relationships actually work. The sooner you learn these things, the happier you'll be.
There is nothing you can do, no matter how perfectly thought out and executed, that will make someone who does not have feelings for you suddenly like you. That's not how people work. You can't just pick someone and work at making it happen. Almost every relationship you will be involved in will be with someone that you never knew you had feelings for until you realize she's the only person you've spent time with for the past 3 days. You don't ever pick someone, you find them.
At the beginning of a relationship, things will be amazing. You will want nothing more than to be with her and learn everything there is to know about her and everything she has ever done in her life and it'll be so exciting and wonderful and you'll be the happiest you'll be in your life. And then all of that will stop. This does not mean you're suddenly going to break up. It happens in every relationship, the connection is just as strong as it was before, you're just both comfortable enough with each other and that your relationship can survive on its own without needing constant attention.
Eventually, you're going to get in a fight, and it'll be the first of many. They'll usually be over something really minor and insignificant that you wouldn't even think could start a fight and afterwards you'll just kind of avoid each other. You, in all probability, did not suddenly ruin everything and doom each other to splitsville. You'll both need some space for a little while, you'll cool down, you'll make up, you'll move on. Trust me, you'll know if the fight you just had is going to be what ends it. It'll be really, really ugly.
Also girls don't need figuring out. There is no hidden meaning or subtext in the things she does, there is nothing to decipher, whatever she just told you means exactly what it means.
And one last thing, you're going to wind up having sex eventually, and I know you want it to be one of the most perfect and incredible moments of your life. It will be anything but. It will be awkward, you'll be nervous and extremely self conscious, you will have no idea what you are doing, you will second guess everything you do, all sorts of things will go wrong, you'll probably wind up making an ass of yourself and you will spend at least half of it just wanting it to be over. Congratulations. It's over, you survived. It only gets better from here.