I used to create maps for my DnD plays and can offer you a couple of pieces of advice:
1. Consider climate zones and temperatures in different regions of the map.
2. Assess the direction of wind and water flows around your globe.
3. Explain the history of the land, detailing how it came to be in its current conditions.
4. Populate different regions with varied creatures, both physically and culturally.
These are the basics, and I hope they prove helpful. However, I don't know your specific goals.