I can post links so here you go.
I like this. The map is clean. The names don't suck. There's a nice mix of terrain types and the rivers seem to be going in the right direction.
But your question is about worldbuilding. There's a tonne of stuff online for worldbuilding, and a few of the D&D DMGs have made a reasonable fist of it. I would also recommend 2E's
World Builder's Guidebook. However, the first thing I start to think of is what adventures do I want to run here and what "infrastructure" do I need to run them. After that, it's a matter of fleshing out people, places, and the pantheon... and don't be afraid to plagiarise.
People: Which races live here and where do they live? Are they traditional D&D-like cultures or are your dwarves, for example, seafarers? Think of three key organisations: one good, one bad, and one neutral (like a merchant's guild). Flesh them out a bit.
Places: Start with three: a city, a town, and a village. Decide which one you will start the campaign in.
Pantheon: Steal an existing RPG pantheon and rename if you feel you need to. Focus on three deities: one good, one evil, and one neutral.
And then sketch out a first adventure, choose which place to start it near, and then build your world from there.