Two things to remember
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it's not personal, it's a game to them, baiting the teacher is more fun at the moment than learning
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Even in your worst lesson no body has died
Agree with, 'getting the buggers to behave' although it is mostly aimed at school children it does work.
As for rules, do a 'class contract' - so get them to write the rules and be realistic. When you first do this they will all say, "no mobile phones", ask them if they are really going to go 4 hours without looking at their phones, of course they are not, so let them suggest something, then you suggest something so the rule might be they get 5 mins to check texts in every hour, but they can lose that 5 mins for behaviour infringements.
Get the rules typed up and laminated and stuck on the wall - they are more likely to follow rules that they have made up and agree are fair.
I have one very talkative group at the moment, who don't listen so I end up being asked 5 times at the start, "are we using computers today?"
I am supposed to have them for 1hr 30, I tell them they can go 15 mins early but every time they talk over me I'll add a min on to the lesson. They usually go 10 mins early after a couple of infringements they start to self police.
The marbles in a jam jar can work with older students, for every thing they do right they get a marble, once the jar is full the group get a treat.
Can you do anything with them moving around? Do you have access to an IT suite or laptops?
If you can get them in to a group or pairs, get them to research something and then present it to the class it can take a bit of time and have them actually doing.
Some groups like 'death by powerpoint', others get bored.
Some groups need to 'get it out of their system' so giving 5-10 mins at the start for socialising, finishing breakfast etc etc can work.
A-Z of your subject, mine's health and social care so either in teams or individually they have to name a term from A to Z, so arthritis, bipolar, etc to zimmer frame. Sometimes we go backwards as well and they cannot repeat any term.