All these questions are for the two of you to decide.  There is not a single standard for every couple.

You might want to find out if some local churches provide some kind of pre-marital counseling. 

My husband and I pool our money and always have.  In a sense, yes, you will be paying child support because you as a couple will not have access to the money that goes to child support.  You need to figure out what will happen when his kids are acting up--do you have any disciplinary rights that he will back up, or is it entirely up to him?

What side of the bed will you sleep on? Who will balance the checkbook and who will take out the garbage? Who will clean the toilets and who will dust? Who will change the oil and who will mow the lawn? Who will cook and who will clear the table?  

Nobody here can answer those questions for you--and they may change over time.  When we first got married almost 33 years ago, we decided that we would alternate doing the dishes every other week.  Well, I was doing all the cooking at that time, and then the dishes every other week. It didn't take too long for the rules to change to "who cooks doesn't have to clean up."  

Congratulations and enjoy!  If you do it right, it keeps getting better all the time--with the occasional rough patch that can be survived.