I've always played just a single sim so far and have never bothered with working out a married couple. I want to try it though and have questions.
Does being in a married couple effect the traits you select when you're set up for a certain career type? Like if you're an artist and you take Loner as a single sim to slow down your social drop, do you bother to drop that if you're building a couple or does it matter?
I have had loners happily marry. Even with couples incandescently in love, there is enough alone-time to benefit from this trait, and it has never been a hindrance. The only issue with traits that I can imagine is the one-time negative hit that arises from incompatible traits. I suppose other conflicts might arise - a light sleeper awoken by an inappropriate or insane Sim being loud at night? But that's just, you know, the game. I say go ahead and don't worry about making a perfectly mutually traited couple.
In The Sims 1, as a couple my spouse would always ask, "Wanna have a baby?" it got pretty annoying because I really didn't want kids. But I also have Generations so I'm wondering how big a deal it is, and if it becomes an issue if they don't have kids.
Of the married couples I have played, only once have both spouses wanted a child at the same time. They are the ones who have one. In other cases, life has offered enough rewards that none of my Sims who showed an interest in child-raising were in any way devastated that I decided not to pursue it.
If you don't want to have kids, it won't be a problem. However, if you have your game set to high Sim autonomy and an opposite-sex couple and
don't want children, keep an eye on your Sims, as they can decide to "Try For Baby" independently!
Basically having more than one family member will let me explore multiple jobs and hobbies at the same time. How does a multiple member family interact and what problems might I try to avoid?
They usually will interact pleasantly. I am currently playing a 4 Sim household, Spouse 1, Spouse 2, Mother(-in-Law), Toddler. As often as not, while Spouse 1 is interacting with the Toddler or seeing to his needs, Spouse 2 is chatting in a friendly way (without my arranging it) with the Mother-in-Law.
Sims do get zany ideas at times, however, and keeping an eye on two or more when you are really only used to one can be challenging.
Any other hints/tips or tricks in regards to this would be greatly appreciated, thanks in advance.
Game tables (chess, foosball, et cetera) and sports equipment like baseballs or footballs or soccer balls or kicky-bags are good things to have around to give your Sims harmless activities to initiate together. My first couple still tends to go outside and play catch if I don't step in and have them do anything else.
Save the game you have before you make the change, then save the couples game as something else. That way, you lose nothing for trying. And if you don't enjoy the new play-style, you needn't continue.
Good luck!