Do you have certain expectations for certain stages of a relationship?
No. But it takes a certain amount of feeling and shared experiences to build into a relationship. Imo, everything else is dating or whatever, but very few make it to a serious relationship.

How long would you give it before you would expect to meet his/her family?
1 year. Because they wouldn't meet my family until at least a year has passed. Well, at least not as my BF.

Before you plan holidays together?
I spend major holidays with my family, so...

Would you continue a relationship if you didn't feel you were in love with him/her, or vice versa? Yes, I do not have to be in love with someone to like their presence in my life and want to continue a relationship. Similar to how you can be in love with someone but unable to sustain a relationship. Takes more than love to build and maintain a good relationship, imo..

Is it good enough to just be getting on ok, or should there be a certain level of feelings or signs of commitment within so many months? I have commitment issues , so I rarely put pressure on someone to show a deeper commitment.

What are your expectations, if any?
Hmm?? That they never lie or never disrespect me, and I'll extend the same courtesy.