First date, need advice about flirting and do's and don'ts

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TLDR; How does flirting work, when do i go in for the kiss, how do i stop overthinking shit, any things to avoid etc., any tips for a first timer dude.

I consider myself a pretty confident person, i have a decent number of excellent friends and in every social situation i find myself to be genuinely appreciated and had many confirmations about this even from complete strangers).

However, i am insecure as fuck around girls. By this i mean: until we aren't leaving "knowing each other/friends, it's all good, i am genuinelyu confident in myself and the other person feels this, and gets comfortable. Maybe too comfortable, since then the flirting starts, or as flirting i perceive their sudden touching and asking more intimate stuff.
Once we get there, i become a sperg, at least inside. While outside i can still show off as confident but still trying to evade from the flirty stuff and going back to the cool friends zone), inside i just want to get the fuck out of there, even if the girls is hot as fuck.

Given this difficulties, i tought that a bit of chatting online first would have made things easier. Well, i managed to get a date this weekend to chill at a park with a girl, which seems very interested in such an idea (she says it's a refreshing sight from the usual boring coffees other people suggest).

Here's where i need your help: i'm already overthinking shit and fearing the moment when, since it's a fucking date, we will have to go into flirty territory once more.
How does one flirt properly? How does one STAY in the "flirting zone"? How does the situation evolve from there? How do i bring out my confident personality (which i have in all fields EXCEPT dating) here?