Camera equipment is expensive and we usually tend to buy the most expensive equipment our budget will allow. So take good care of it. Buy some lens cleaner and a lint-free cloth to clean the glass. Most camera shops stock inexpensive kits. Keep a blower in your bag to blow off the dust from the lens and sensor. DO NOT use the strong dust blowers in pressurized cans; they can wedge dust further into your camera due to their strength. Rather use a hand-held rubber bladder type dust blower. I have been very happy with the VisibleDust Zeeion Blower Sensor Cleaner. It is light and takes up little space in the camera bag, and has come in very handy when in the field to quickly blow off dust spots.
And certainly take your camera and lenses to a local repair shop to have it cleaned and lubricated once in a while. One of the best times to do this is after a trip that has taken a beating on your camera, such as in a dusty or wet area.