Get To Work. I can't find the hospital

It asked me if i wanted to go to work with my sim. I said yes. But then if i tried to treat the person the sim would yell they couldnt “walk” there and it also told me to deliver food to patients, but I couldn’t see any patients. And that I needed to put a patient in a bed and there were no hospital beds

There's usually a coworker in the way when you try to treat a patient and your Sim won't go. Try talking to the coworker to get him out of the way. (Click on the floor and Chat Here if necessary.) 

Look for patients near the front counter if all the beds are empty and use Medical Referral/Assign To Bed to get one that you can deliver food to. Check the surrounding area if there aren't any patients at the counter. 

There should be 5 or 6 beds on the right side of the hospital as you go in the front door if you're using the standard hospital. (I don't recommend using a custom-made hospital.) 

It's a little confusing that you found a patient to treat but you couldn't find any to deliver food to or find any beds. You should be able to deliver food to any patient that you can treat or examine, and that patient should be in a bed. The other beds shoud be nearby and that's where you should find any other patients that have already been checked in.