Just as an example --- on the link you specified there are some RTA's (
Rebuildable
Tank
Atomizers)
Here is one
GeekVape Ammit 25 RTA Tank - (25 mm, 2/5 ml) - Vapes.se Sverige
Having a little issue with link but go to the site and click on RTA and then click on the Ammit
I am a little more familiar with Geekvape so I picked this one because it takes a single coil, fits your box well, has a decent juice capacity and is easy to build on. It also comes in enough colors that you can find one to match your mod box. If you go through the pictures at the link you will see what the rebuildable deck looks like.
And if you watch this video - particularly from the 3:30 mark on you will see how it is built.
It took me a while before I started to build and once I took the plunge I never looked back. You can get help from here and from watching the videos. That's what I did.
And although I do have a good amount of wire - honestly I just buy the coils in bulk - they are much less expensive than the drop-ins and once you do it a few times it is so easy to change out. You can even try different types of premade coils that way. If you are so inclined you can fully make your own.
You need cotton which is easy to get and a little stick tool to straighten out the coils. The other thing you need is either an ohms meter or you can use your vape mod to check the resistance - I will find links and post.
(Just a note --although it is not hard there are a few things that you need to know when rebuilding --you have to check the resistance and make sure the coil is installed properly. The videos cover that.)