What are you going to do with the site?
If you want this to be a long term moneymaker, you better not do anything even remotely black hat with it. You nay get away with it, but in the future Google will change the algo and snatch it away just as they always do. If you game the system to improve your rankings, you may lose everything you have worked for.
This is going to go counter to a lot of the advice you will get, but I would not fiverr, xrumer, scrapebox, or do any automation at all, and no bulk backlinking.
These forums are full of people who did what seemed harmless, only to lose everything just as it was taking off, sometimes after years of work.
Don't take any chances with a golden goose.
If as I suspect, the results in the SERPs are not fully optimized for the keyword, and they are all Google has to offer, then simply fully optimizing your site for the keyword may give you the number one spot. Things are different when you are doing local, you have almost no web savvy competitors and ranking is usually fairly easy if your keyword selection is properly done.
I also suspect the keyword was chosen for brand building instead of traffic generation, since it has no competition. Or did you find a real GEM?
I would do this. Build the site and fully optimize it for your keyword and a few LSI's. Promote this website by adding it to Linkedin, facebook, and a press release, set up Google webmaster tools and submit a google sitemap. Do the normal things a starting business would do.
Next, I would find a reputable press release site, and pay them for a full distribution. (The site I use charges $129). This will create a steadily increasing flow of backlinks as the press release is picked up by news organizations and propagated around the world. The rate of link acquisition will start slow, build up, peak and fall off as time goes on, but a the links pass serious juice and really stick.
Nest, to gain authority I would find a piece of software that you have give away rights to, even if it is a WordPress plugin. Rebrand it as yours, and build a PAD submission, and submit the software to the every download sites you can find as a free tool for your customers.
(I use a program called Pad Submit Worker to do this with).
It works even better (the links pass more juice) if the software is related to your keyword, (I used a PLR car loan calculator for a local auto dealer),but these links are very powerful and pass a lot of juice even unrelated.
The download directories have incredible authority because they have been around for years and most have high PR. I can now post software to CNET, a very high authority domain.
The company name in the software submission will be the link to your site, and if you are crafty you can work your keyword into the company name your software is submitted under and have the keyword anchor text you want. You do not have to use your real company name.
If you take the three most well known places that approve your software and put them on a card to pass out to you customers, you gain a lot of credibility in their eyes. To them you have to really be a great company if you develop and give away free software to the public. If they have to go to a site like CNET to download it, you look even better.
I would venture to say in three months time, you would be invincible in the local market, do a new pad submission every 3 months for a year and you are 10 foot tall and bullet proof.
Let your site grow other backlinks naturally, don't even concern your self with messing with it.
