making a ss mesh wick is actually very easy, it may look complicated at first, but dont let that scare u.
Wire rope and mesh wick is simular to prepare really, u still need to wrapp a piece of mesh around the top of a wirerope so the coil make good contact. Downside with wirerope is that is very powerconsuming since its so solid/dense. Some say wirerope gives u a bit better flavour over meshwicks, but i dont agree on that.
Mesh is cheap, easy to make, lasts long, excellent wicking outstanding vape and flavour. Nothing like silica or ekowool can even come close to match the flavour or vapor production in a gennie. and yes, you can adjust the thickness/tightness of the wick to ur liking, its all in the ammount of wick u chose to roll or wick from, and also the # number u chose. I recomend starting out with #400 mesh or maybe even 500, since they wick extremely well and is easiest to get a good wick from and will most likely wick fine even if u make ur wick a bit too tight or too lose.
Oxidizing only the top part of the wick is best, since doing that to the entire wick will distort ur flavour and faster gunk buildup on the coils. If you end up with something like the RSST, u dont need to oxidize at all and u can just use the pulse metod wich is very easy. You can also do the pulsemetod on for example the aga-t2, but thats a lot more tinkering and u will burn of the coilwire a few times.
Edit: i see you mention cotton, cotton will also work well in a gennie, but im not a fan of cotton, thats just my personal preference tho, many loves cotton. Cotton setups are very very easy, by far the easiest you can do. But, You need to get some good cottonwicks and most likely u will need to boil it before use, most cotton has a funky flavour before being boiled, some doesnt mind that, but most dislikes it. Downside of cotton is you need to change the cotton pretty often, but thats a fast job in a gennie. If you want a way to setup ur gennie easy cotton is def a way to go. Search cotton wick in genesis and im sure u will find a video on howto.