I was a MSA for about 8 months 9 years ago.
We didn't have a dress code. As if !!
Comfortable, practical clothing.
I almost never worked outdoors, my duties were usually inside.
We had to clean up areas at end of shift, sweeping & mopping unpaid & lug tables away.
We only sometimes had brief chats with teachers about specific kids.
Can't recall how I was paid... monthly probably into bank.
Beware the kitchen space all has rules about what can go where, they have special sterile sinks (can you tell I once got it wrong).
Wet play days were different, a lot more challenging, we had to manage whole classes in their rooms & get them not to be too wild & tidy up after bell rang.
First aiders are designated regular people, you just know procedure to get kids to the first aid area. We once had epi-pen training, and had to know which kids had allergies to be aware of their signs of a problem coming on, is only special training we got. Otherwise health issues were outside our remit.
You may need to know bits of info about kids with SN or difficult home lives, this only happened to me once, though.
The little ones need encouragement to eat & not just socialise or day dream. They may need drinks poured for them to avoid mess.
yeah the older kids may take the mick but so what. You can nicely banter back. Yr 6s are delicate flowers in the SAT week, though, that special treatment time was sacrosanct.