As Mike explained and as per my knowledge, a 3D Murthi should be prayed with daily rituals. You should offer Naivedyam every day atleast either with a combination of cow Milk & sugar in a small silver bowl or new steel bowl or sweet payasam. Deepa Araadhana ( New cotton wick lit with cow ghee or with oil atleast) should be given. Cleaned flowers and cleaned fruits are also can be offered. Incence stick at least smokeless should be burnt. It is a symbolic offering that you are burning your ego or desires to a final form that cannot be reversed. Initial prayer should always be performed on Ganesh followed by other gods. Gods are to be prayed by offerring turmeric powder and Kumkum ( Yellow and Red colored powders, prepared from fresh crop - Available in Srilankan stores) and Akshantalu ( prepared with rice and turmeric powder) with three fingers (other than index and middle fingers). Harathi (with Camphor) can be given at the end. You should put bindi on your forehead before praying and sprinkle akshintalu on head after prayer.
Forget to mention, you should take bath (preferable headbath) before prayer and wear fresh colths while praying.
Though worship demands your time and effort, you will be blessed with desirable will power to sail through your life hurdles. Don't look for any return or warranty but pray with selfishness. God bless you.
PS: The prayer procedure I provided above is a typical South Indian style. There can be different versions changed over time.