Instructions on how to hold a conversation

This was going to be the post on "what is reasonable in conversation and social interaction" but it has turned into a list of points that I must consider when making conversation. They're just off the top of my head so it's definitely not exhaustive, but certainly exhausting!

I often struggle with what is reasonable to say. I used to just say very little in group situations or with people I didn't know well, but I have got a bit better in the last few years: gained some confidence, realised people think it's weird if you don't talk, realised people may actually sometimes be interested in what I have to say. The trouble is, sometimes I can have real trouble knowing whether to say the thing that's in my head.

It should be relevant, but it is OK to slightly change topic to something related. Is my thing related enough?

Has the conversation moved on since I thought of what I was going to say. While I was waiting for a suitable entry point, is my thing still relevant?!

It should be interesting. There's no point taking the floor in a conversation if what you have to say isn't interesting.

There should be a point to it - a reason for saying it, and a potential route for the conversation to extend. Dead ends are very embarrassing.

Funny is good. People like funny, and people find sarcasm/being slightly rude about people you get on with/literal interpretations funny, but only to a certain extent. If they don't realise you're being sarcastic or joking they can think you're really mean, and literal interpretations can go completely over people's heads if they don't think literally.

Things don't always come out how you meant them, and what was meant to be a perfect interested question or a light witty comment can inadvertently cause great offence or embarrassment for either party or both.

I used to think the rule was never to talk over somebody, but actually I have observed it is quite a usual part of conversation. So it's sometimes normal to carry on what you're saying if you accidentally start talking at the same time as someone else, but how often? What if you both stop, and then debate about who should go on? Should you insist they do or should you go first? Is it related to how important your thing is?

You should say enough, but not too much. If you don't say enough, you are boring and weird and a nobody. If you say too much, you are boring and weird and annoying. But how on earth are you supposed to work out how much is enough and when it becomes too much?! What if you just can't think of anything to say?

What is the appropriate length of answer to give when people ask a question? Is a one-word answer enough? Is an anecdote too much? Am I supposed to return the question after I have answered it?

You should remember what people have previously told you and ask appropriate questions. Asking questions is a good way to keep conversations going, if you can think of some. I like to listen to other people, and other people like to talk about themselves, but sometimes they won't until you ask a question.

What is the appropriate response to a compliment? I used to always brush compliments aside as they make me uncomfortable but I have been told this is rude and negative. I think you're supposed to say "thank you" and perhaps make a related comment. Then I have a feeling it is usual to return the compliment. But not the exact same one, because that's weird. So find something else to compliment them on. Do you always have to return one or is it sometimes OK to just accept one?

How much should you look at the person you're talking to? Must give some eye contact. But not too much.

How long should you talk to somebody for? This depends on a whole gamut of variables!

How should you end the conversation? It's good to have some rehearsed exit lines up your sleeve to try and avoid awkwardness.

And I haven't even started on how (or whether) to enter the conversation in the first place!