[how to gets orders]

First Select the service that you want to provide . Then research keyword on fiverr on your service . Make a fully optimize gig and try to rank it on that keyword . There are many things in between but These are the main step .

[What's the specific time period of holdays of buyers]

There is No specific holidays time duration on Fiverr . But I have seen most of the buyer are from western country's . So as a result I have seen buyers are not much active during Christmas Holiday time . 

[Additional Fiverr pricing]

When You Set your Gig Price it automatically selects your local currency . But when someone from like US visit your gig it Automatically Converts your package price to USD . Hope it Helps .

[How to get clinte i have not get any order.]

As far as I know , If you edit the packages, prices, or names of the packages. If you edit the description, your ranking won't be affected .