Icosahedral Map starting point for unnamed fantasy setting one

I'm trying to get together a global map for unnamed fantasy setting one. I know nothing of map making so I've started with an Isohedral map because it's kind of easy. From here I'll probably make a sinusoidal map once I'm happy with the coastlines. Then I can look at adapting it into one of the unexploded projections (which are distorted but don't confuse people as much). Future maps will also be higher resolution and better colours. This was purely so I could see where things go. And the equatorial continent I was planning turned into three large islands for some reason. I know there's a lot of sea - it's a global map so that's inevitable. Having said that I think there may be too much sea. I'm not good at eyeballing area so I'm not sure I have 30% land. I'd really like to make the southern continent a bit bigger without it getting too close to the northern one.

Any thoughts?