A picture is worth a 1000 words and today you can find them everywhere, download and print and say this is what you see.
Monsters: Size, number of legs, common animal referance (man/dog/oxen/lizard/bird) fur/scales color. You see a large forest green two legged scaled man-like creaute, it has a long tail and is carriing weapons... You see a dog-sized grey/brown six legged lizard...
Objects/locations - I try to do 25 to 50 words, general size, what general object it looks like, lighting, noise, smell. The item looks like a staff made of metal, one end is a craved statue of a wingless dragon, down the shaft is cravered runes, it is heavy in your hands and not very balanced. Your torch lights up the room, it is small, you could cross it in three steps, their is a damn musk smell in the air, a door is across from you...
Order of things:
...Light/color
...general size
...Special Feature
...then detail if asked
Also, list of common things players would know in the world for reference: pilliar, oxen, wagons, lenght of a persons forearm, columns/pillars, kettle, bucket, wood axe, horse, dragon...