4 weeks +2 optional in case, you need time to understand what he/she likes and dislike, then how much in common you both have (a good 60/65% is good), then try to find a place she/he like, see if you can pay for both, then invite he/she there, but not like "hey, let's get on a date", something more like "listen, I know this place, and I think you like it, so... wanna take something one day ?", then going there, speaking, chatting, paying for both (don't insist too much, if she/he want to pay his/her part, let she/he do it) and it's done, first part of a date done, the rest is for getting in touch, but is better to not rush nor going slow.
Am I the only one that can dispensate good advising on dating and never get a girlfriend thanks to a mixture of panic and cowardliness ?