Help Required BMW 3.0 X5 Diesel

[Gregvip1]

Hi Guys
I am here for some help. I have a 2001 X5 which i brought 6 months ago. Full service history but the last service was an oil change so i am about to need a service prob inspec 1. I would like to do this myself. The car has 56k on the clock. I have seen how to change the oil which is fine, and the micro filter. is there anything else, is there a pollen filter if so how easy is this to change. also an air filter.
I have noticed when i put my foot down i get black smoke coming out of the exaust. not loads but quite a bit. i put this down to needing new oil.
Also does anyone have views on using an engine flush when changing the oil.
Thanks for you assitance. I dont want to go to the stealer as i enjoy working on the car myself and then i know for sure it has been done. Does anyone reccomend a good oil at this mileage
Greg