materials from blender

i am trying to import some custom assets i am making, i have just a base color as a texture in blender just for testing now, but when i import the .dae in beam it's completely black in the preview and when i add it to the scene it's invisible.
so what would be the best way to make materials in blender and import them correctly? i also want to make them pbr.

this is what's in my main.materials.json

"wall": {
"name": "wall",
"mapTo": "wall",
"class": "Material",
"persistentId": "31994a3f-71d7-48b8-a302-bfb52ce4e87a",
"Stages": [
{
"diffuseColor": [
1,
0.5,
0.200000003,
1
]
},
{
"diffuseColor": null
},
{
"diffuseColor": null
},
{
"diffuseColor": null
}
],
"translucentBlendOp": "None"