New Owner 545i

Hey everyone. I recently bought a 2004 545i Sport Package Cold Weather Package. Car is excellent condition inside and out. Silver with Black Dakota Leather. Car has 34k miles. I love it already. Ive had it only a week and it feels so good to have a BMW again. Ive went to a C Class Mercedes which was brand new and an Audi A4. Truly nothing drives like a BMW. Anyway I love reading these forums and I want to learn a lot about my car. Im not really a DIYer but Im willing to learn any and everything. I have a good friend that will work on my car but Im open to any info any of you might have on this vehicle. Any advice for this particular year or any personal experiences. Again thanks for all the great posts. And Im looking forward to hearing from anyone about anything. Thanks. Positives would be great because i hate to think negatives at this point. Thanks