I Need Help! How Do You Take That Next Step To Feel Comfortable To Seriously Date Online?

I need help! I’m a 26 yr old guy starting to delve into online dating as another venue. Up to this point, I’ve always felt meeting online and conversing intimately online to be two dimensional for my taste and just not for me. I’ve always felt conversing and relationships in person were more genuine.
But, I’m trying to change this because I met two great girls who would like to know me and vice versa online (unfortunately it’s long distance too). This experience is completely new to me and I need basic tips on communication, feeling comfortable doing so and being able to keep things fresh and non repetitive. I think my main problem is just getting past the ‘how are you’ type letters and feel i need to up the intimacy to show interest. If I don’t I usually withdraw but how do i do it without seeming like a pervert or coming off desperate?
I know I’m asking a lot, but could you provide me with good and bad experiences, several things to avoid talking about and things to talk about?
Much Thanks!!