bubu, I think you should restrain yourself and control your urge for sex until you find some girlfriend or get married,whichever earlier. Your profile is incomplete so we do not have idea about your age and relevent background. But from your desparation it seems that you could be either in early twenties or late teens.
Still if you want to proceed (I assume you are not a minor) .
1) How reliable this friend who shared this number with you? Does he have a first hand experience with this woman or he also got it from one of his friends?
2) Never use your phone to call her first time. If possible use public phone.
3) Whatever the place would be, it should be chosen by you .So no threat of blackmailing, recording would be possible.
4) Avoid going to cheap hotels and lodges beside train and bus stations .
5) Best option would be at home (yours, friends) if you can manage the logistics of bringing her safely in and taking out without being seen.
6) If you have so much fear of the law(which is a good thing) why you want to go for it? If she were a cop and suppose would use a code language then except she, how can you expect us to know about it?
7)If you choose to go at the place set by her be aware that it could be' honey trap'.
Honey trap means as soon as you go inside and without you even touching few men would turn up pretending to be her relatives and they would intimidate you and threaten to call cops and your family and at last would settle for some money. Its real and happenning all over.
If she ever gets ready to meet you insist to meet her at public place first and when you meet her observe whether she is (and you) are being followed by anyone or what! Hope this helps .