Hi hibjib10987!
I use coal and Ive worked with charcoal before. One thing different is youll probably use a lot less coal than charcoal- coal doesnt burn out as quick as charcoal does.
The other thing is clinker. No big problem though, just clean out the fire now and then and it shouldnt be a big issue.
And then theres smell- it depends on what quality coal you have- bad coal have a lot of sulpher in it so it makes a lot of stinking yellow smoke when you first fire it up. So make sure you have enough ventilation!
Thats just my opinion fwiw!
Bb