Every scheduled food offering is followed by an arati. Except
for kirtana, offering arati is the only regular daily function of
deity worship performed publicly.
There two basic types of arati offered in ISKCON temples (both
described in the section on how to offer arati) but according to
your circumstances and available facility you may offer whatever is
Arati is performed at 1½ hours before sunrise to awaken the
deities. Each offering is made by moving it in 7 big circles,
starting at the Lotus Feet of the Lord, and going clockwise round.
First of all, burning camphor or ghee (5 fires if possible) is
offered in this way, slowly circling them before the Lord. With
left hand bell is being rung, and with right hand the offerings are
made by circling. Next burning dhupa is offered. Then water is
offered in a conchshell. Then a nice handkerchief is offered. Then
a nice flower, as a rose. Then the deities are offered a fan, nice
peacock feather fan. And the last item is the blowing of the conch
shell three times. Throughout arati there is bell ringing, cymbals,
mrdanga, gong, harmonium, etc.
So far your question regarding deity worship, during arati
everything should be offered first to the Guru.
The cloth offered in arati, should be pure cotton or pure