Welcome Newtrain!
For track and turnouts for a beginner, it's hard to beat Atlas, they make good track at a reasonable price. There are other brands, some are more expensive. There's also track and roadbed together, which I've never used so I won't comment on it.
Stay away from the old brass track. You can get it cheap, but it's a headache. It tarnishes and your trains stop running. Stick with nickel-silver rail.
Do you have a track plan you're following?