A gig refers to an online micro-gig or micro-job. ... A micro-job on Fiverr is called a “Gig” and gigs start at $5. It basically means that the base price of any service on Fiverr is $5 (also known as one Fiverr). But the order can be hundreds of dollars if you provide add-on services.
The 'quantity' is just like picking up another 'item' from the shelf - so this can vary depending on what you are looking at. If you bought something like a logo design or whatever, a 2nd gig would be a second design, not a second copy of the first one.

Fiverr is best for freelancers to offer their services, whereas Freelancer lets you post job offers and projects. Fiverr keeps 20 percent of your gains, whereas Freelancer comes with monthly plans and different ranges. Fiverr is best for a one-off gig, whereas Freelancer off

You can use Fiveer

1::Be creative! You can offer any service you wish as long as it's legal and complies with our terms. There are over 200 categories you can browse to get ideas
2::It's free to join Fiverr. There is no subscription required or fees to list your services. You keep 80% of each transaction.
3::With Gig Packages, you set your pricing anywhere from $5 - $995 and offer three versions of your service at three different prices.

You can use that to sell gig easyly