1ml I wouldn't notice that much - just a buzz.
3mls I would feel drunk on and it would wear off after a few hours. also horny as hell and fun sex.
5mls I would have to really fight just to stand up. I'd be horny as hell, but not have the ability to do anything about it and would likely faceplant after an hour or so.
10mls as soon as it would hit (depends on how full your stomach is), it would knock me out wherever I was and I'd piss right there. so generally I would not recommend that much.
it all varies with weight and metabolism, as well as what is in your stomach.
generally, I think they say to go with 2mls and then after 20 mins, if you don't feel anything, add another ml, and then wait another 20mins, etc.
go slow - it is easier to say, shit, I didn't get high or pass out this evening instead of waking up in a hospital because someone found you and had the wrong idea (too much and you are OUT cold)