App Killer app that force stops apps needed

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AC Question

I am in need of an app, an app that (without root) kills (force stops) apps I want, becuse they always run in the background and I cant make them go away (or can I? does anyone know a way?). This app also needs to stop killing the apps I select when I enter them, and continue killing them when I exit them. If there isnt an app like that, prehaps someone can help me by writing (in detail) how to stop some apps from starting when I turn my phone on and from running in the background when I clearly am not using them.
Thank you in adv.
My phone specs are Android 5.1, 1.5 GB of RAM, MTK6735 64bit quad core 1.0GHz
 
The important details missing from the question would be the list of apps you want to kill.
Many of the services (not apps) running in the background are not optional.