Ok so please before you try this do some reading on battery safety and how to use this ohms law calculator to know if the coil you are building and the battery you are using will be a safe combination.
Ohm's Law Calculator
Also look up how dual coils read on an ohm meter because it's not a matter of building two coils of the same resistance and the result is a total resistance of the two, it's actually the opposite and you could end up trying to fire something like a 0.1 ohm coil with a battery that can't handle it.
With that said, if money is a factor I would start with items such as the following....
Mechanical Mod - $24.69 usd
If you buy this one from this site there are add ons you can get such as the charger and btteries. I use the SONY VTC4 18650 2000mAh about $23.00 usd
You have to have a really good battery like this, that can support 30amp draw when working with sub ohm coils.
Also get a good charger such as the Nitecore Intellicharger i4
- around $20.00 usd on amazon
Then you will need a tank or a dripping atomizer.
If you prefer to have a tank that you can set up cotton wicks and coils that "auto drip the juice, I would start with the SmokTech RSST Usually about $30-$35usd depending on where you get it
This rebuildable tank is nice because its single coil, easy to build on, and feeding your cotton wicks into the tank is pretty easy.
If you want to use a dripper (where you have to drip more juice ont he coil and wick when it starts to get dry) I would go on ebay or any site that sells clones and look for an Atomic RDA clone
. About $25usd but get the EH Pro version.
Regardless of whether you want to go with a rebuildable tank or dripping atomizer, you will need some supplies to build the coils.
See this post for the tools and materials I use, the materials last a long time fyi.
Please make sure to get a cheap ohm meter that is made for testing atomizers. If you don't know the coils resistance, you can't be sure you are vaping safely.
I can't think of anything else atm the moment but if you have more questions please feel free to ask. Vape safe