Share the video related about your service.

best way to gain likes is...don't think how to get likes, think how to impress your user. Simple theory i want to understand :)

There are lot of ways to get likes from FB. Many of them are to make your pages attractive and post interesting common content that user must do like.

How to get facebook likes?
 

Share informative video in your Facebook page.
Ask your friends to like your page & share whatever you post.

Join groups and communities

Quality likes, not quantity which aren't relevant and aren't interested

Update news time to time.
Share video about your service

Invite friends, keep posting pictures (if a person likes your picture all his/her friends Can See he/she liked your picture and can directly go to your page and maybe like!) Keep your pictures descriptions away from "Like if or like cause" people hate that. Good luck! Oh, and give me a link. I Will like for sure. :)

Invite your friends to join your fan page. you also can run a ppc campaign and increase like on your page or contribute in related groups and ask people to join after networking with them.

It really boils down to content. If you post interesting, unique stuff that catches the eye, people will 'like' it. Of course, you have to keep up the content production because if there is nothing popping up on people's news feed...well, you won't get any 'likes.'

Yup!! If you are posting interesting stuff on your facebook page and things are going viral then it can generate many likes on your fan page.

it is a consistent process......regularly update facebook page ........Just keep on posting to your facebook page, add funny pictures related to your post.

I think good profile pic and increase your friend list.......

IN Facebook likes
 

Join the large groups and submit there link

You need to create your page, remove privacy, ask any admin of official pages to post your page link, put your link in somewhere else comment and post in your profile daily.
i hope this will probably help you.