LDR and a sex life?

So my boyfriend and I are currently in an LDR and we've always been really physical. So it's been a huge change. We've been talking about phone sex and sending nudes. The only issue is that I've never done any of that before. I'm pretty shy when it comes to things like dirty talk or sending nudes. We're going to be apart for months at a time so I feel like I need to try. But I just don't really know where to start. Does anyone have any advice?