There is number of things to keep in mind when you visit a temple.

Image source : Google image

Image source : Google
The first thing is that you are not wearing any leather things. If you are wearing leather things, you need to take off them before you enter the temple . The second thing you need to considered that you should take some flowers with to worship.You may some times do not get chance to buy flowers at the temple. thirdly You have to stand in queue if there are many people waiting for worshipping.