All you need to do is Download the actual bot client from eaither rsbots.net or rscheata.com. Every thing is already set up, when you buy the bot you are buying the access to use the script that is already inside the Bot Client. Once you buy script you will recieve a authorization code that enables you to use the script. So no programming involves, very simple and fast.
Also if you are thinking about purchaseing what bot. I suggest perfectious auto fighter from rsbotting.com. Probolly the best auto fighter you can get when it comes to runescape bot scripts.