How do I flirt on dating apps and websites?

OK I'M 34 and a single mum to a nearly 4 year old and I've been single 4 years now.

even though I've had a few dates with a couple of guys (one was just really rude n I walked out on him, the other I had 4 dates with and found out he does and sells drugs so I ended it). .. I'm getting a bit fed up now and i want some attention, starting to feel a bit unattractive too but i am struggling to meet straight guys.

My friends have suggested I try dating sites, but last time I went on one, it was just full of creeps that only wanted some "fun" and it really put me off.

Does anyone have any tips, how can I set up my profile to make guys know I'm not easy like that but so they are still interested in me?