The fear can affect anyone from time to time but it is only a case of funneling it in the right direction to achieve a positive outcome. Don't think about it so deeply, or intensely. Just think she has already agreed to meet you which is a massive positive! Confidence is the key to any situation and this comes from looking at situations positively, for starters be confident as she said yes!! Quoted from Mystery "Fake it, until you make it!" trust me it will end up pulling together.
All relationships have to start somewhere and this generally means establishing a good rapport with the person first. The fact you don't know anything about the girl is a positive thing as it will give you loads of open topics to discuss, if one topic starts to turn sour then move on. Females are really clever when it comes to body language so she will sense some sort of nerves within you, but this isn't necessarily a bad thing as this shows a genuine likeness towards her and also shows that you are not robotic, she will be feeling exactly the same. It is just easier for females as the omen is on us!
All i would advise is meeting in a public place such as a bar or restaurant in the evening or coffee house during the day, and keep it short (i would say about 2/3 hours maximum). This way you wont run out of material to say and it wont become stale. If your the one that "has" to leave then it will keep her interested! Don't be thinking about sex whilst with her! Day dreams are for private times! When you are with her stay focused and listen to what she says! That way you will be able to respond to what she says and have a good conversation! If you can through in some cheeky banter, a little joke here and there but always smile to let her know you are playing!
Finally, just enjoy yourself! If she sees you enjoying yourself then she will naturally enjoy herself as well, humans have a natural gift to mirror the emotions of the person they are interacting with!
Good luck! let us know how it goes
Peace, Cola x