There's many great RDAs on the market nowadays for around $30. Drop, Dead Rabbit, Bonza, Pulse 24... They're all reasonably easy to build in, the easiest being the Pulse 24, probably, with it's postless design. I love the Drop though, again, very easy to build in. You can buy some prebuilt coils, something like a standard Clapton or Fused Clapton, there's some quality Alien coils to be had too, I usually just make my own coils or buy the Aliens from here https://www.interstellarvaping.co.u...-coils-1/products/tri-core-alien-clapton-coil these are amazing! Then you need to buy some cotton, this is my favourite cotton atm and it'll last you for a good while https://www.vapeclub.co.uk/rda-rdta-cotton-wick/cotton-bacon-prime-vape-rda-uk.html. Then you need some wire cutters and some screwdrivers, but RDAs usually come with a tri tool that will have everything you need anyway. Oh, you'll also need some tweezers, ceramic ideally so you can tweak your coils as you pulse them. Something like this will be perfect for the job https://www.amazon.co.uk/Aussel-Zir...pID=31c4Al2s7cL&preST=_SY300_QL70_&dpSrc=srch RDAs are easy, you undo the screws on the deck, pop the coils in, screw them in, wick them, juice them up and you're good to go. Watch some YouTube videos, maybe some reviews of the Drop, most reviews will show the reviewer dropping the coils in and wicking etc so you'll have an idea.