MrMill,
Welcome to the group.
You'll get lots of advice, and lots of it will vary widely. Your oil question is a good one, but the answer depends on the intended use of the engine.
Right now up here in North Dakota it is a little chilly - I actually had to put on a jacket the other morning. So I am using 5-30 right now, and I usually use 10-40 in the summer. BUT this choice is for just normal driving in the ND winter. I'd probably use something thicker if I were racing, or if my engine had 150,000 miles.
I'll use a synthetic after the engine is better broken in - there's only about 3000 miles on it now. I wouldn't use synthetic if my engine burned oil or leaked oil, it's too pricey for that.
One of the things you might want to do is to go back into your profile and add your location and under interests your car's information. In answering your question, it does make a difference whether you live in Brownsville TX or International Falls, MN. For computer snoopers sake, you probably don't want your whole address. If you notice the left bar, you'll see that lots of members give their location their too.
Welcome and Good Luck