To start off. I am not sure if you know what exactly that you want as newbies are often confused with VPN or VPS.
Since you want to know about VPN, here's a link to knowing more about VPN. http://www.pcadvisor.co.uk/how-to/internet/how-use-vpn-set-up-vpn-for-private-browsing-2017-3466190/
If you must, it is better choice to go for a premium service as the ip you get may be less used compared to a free service(got to find out). And yes, you are able to toggle on and off.
While you are botting, you risk chain ban (all accounts banned).
By the looks of it, it would be a wise choice to purchase a proxy instead.