Changing fluids in a case 1845c?

Hello all. I own a Case 1845c skid steer/loader and I was wondering what maintenance I need to do on it. I plan on changing the oil and the hydraulic fluids in it. Are there any other fluids that I should change in it? Also, how often do I change such fluids? I hear every 400 hours of service. Also I plan on greasing all the fittings (nipple lubes) as well. Where are all of the fittings located? Any recommendations on the type of grease? My brother owns a Bobcat skid steer/loader I believe and he tells me I should replace the hydraulic lines in it because if any air was to enter the system. I do not think that is a problem. Hydraulics function properly. I told my boss (I work for Case New Holland (CNH America)) and he said that is not true. Who is correct? I do not have a manual for my 1845C (I plan on purchasing one). Where is the drain plug located for the oil and the hydraulic fluid? What type of hydraulic fluid and how much do I need to add? How many quarts of oil do I need to add? I stopped by my local tractor supply and priced a hydraulic filter (I purchased an oil filter already) and it was $60. Where can I find filters and what not for my 1845C? My tractor supply is highly priced when it comes to such items. Can I purchase the fluid(s) at Wal-Mart? I already use Rotella T 15W-40 motor oil. Any help would be greatly appreciated. Thank you one and all.