People are obsessed with numbers, it is true if you have a large follower count it does make you look like more of an authority.
If you are starting from scratch with just a few hundred followers you do not want to spend more on trying to increase your follower count as this can be expensive.
My suggestion would be to spend your advertising budget on targeting people who will sign up for services or buy your products.
You will see more of a return on your investment and those people in turn will share your content to their friends and like your page in turn.
So think about your products and services and don’t get too hung up on the numbers initially.
If you want any help or advice with your Facebook Advertising, please get in touch.