We've got several articles about dating on the spectrum and about flirting!How Do I Tell a Date I'm Autistic?
This one also includes some info about online dating, specifically.
Communication includes not just flirting but also becoming aware of and expressing your needs: Expressing Your Needs Isn’t Asking Somebody For “Favors”
This article talks about how to flirt, in general: I'm In the (Friend) Zone
horriblegoose responded to your question about how to flirt in another thread, which was good advice. Can you check out these articles and let me know what questions you have from there?