First, take off the UV filter. It is only needed ifin case your lens in faced with danger such as flying sand or splashing saltwater.
Second, get a proper camera bag which fits your camera and lens attached. Keep them that way. The camera and lens together make a better seal than the body-cap and rear lens cap. Also, put back the lens cap whenever you are not shooting.
Always store your camera clean. Before putting it away for the rest of the day or night, make sure the surface is clean, particularly the lens and then the LCD. Both can get scratched if you accidentally rub hard particles on it.
Should your camera be exposed to salt, clean it with a moist cloth and dry it thoroughly before storing it away. Be careful around the mount and edged of buttons which it can enter the camera or lens.
For long term storage, you can add a small bag of silica gel in the camera bag. This will protect it from humidity which may be needed more if you live somewhere humid. Also, as commentators suggest, remove the battery and put back its cover, if available, to avoid shorting the contacts.