Hi, I just saw your post re it is a special school.
I visited a special needs special school as part of teacher training and it was a joy. Very warm and supportive with small classes and lots of support.
The children are as individual as anyone (probably more so!) so no magic formula (as stated by pp) and you will need to get to know individuals to work with them well but you can find out some frequently occuring traits by reading up on autism.
I work with adults with learning disabilities and autism can occur alongside other diagnosis too e.g. someone with Downs Syndrome may have autism and someone else may not. You would probably work with all kinds of special needs though.
I wouldn't worry too much about physical intervention at this stage. I would expect it to be reasonably rare and the least amount of intervention for the least time possible- I expect it would mostly be physically guiding someone from the room to a quiet area for example. If you need to do this you will be trained in appropriate child focused techniques _ I don't think it will be a day to day thing as the schools expertise (and yours) will be in managing the children to avoid the need for this.
To give an idea about the variety for some of the (adults) I work with they have to follow a certain routine like shower, pyjamas, hot chocolate, bed. If someone didn't know and so didn't give them their hot chocolate they would be distressed and if they are non verbal you can imagine how this is upsetting for them and leads to problems. Some people like to know what they are doing later to mentally prepare. For others they will worry and stress and it is better to only mention the activity when it is time to get ready and go.
For some people cues/objects of reference are important so there is someone who is only given his shoes to put on if it is time to go out. Again if a worker didn't know and he put his shoes on he will think he is going out and would be confused/frustrated if this didn't happen. I'm sure these types of issues (with more relevant examples follow through into school) basically individuality and individually tailored plans are everything (and then you have to adapt that into a shared space/classroom setting ) phew!
Some of the children will have medical needs to so if your background in nursing means you are comfortable with medical needs that would be a huge plus and you should point this out. That doesn't mean you need to know everything about it e.g. one of the children might have a peg food system and you might require training to manage this (probably have to do the training) but that is fine but just sell on the basis that you are comfortable with medical needs and if you are not familiar happy to go on training.