Its not really something that anyone here can teach you how to do within the space of a forum post. Most basic penetration testing courses (that actually teach you how to do something technical rather than just give you an overview) run for 5 or more days and they have fairly high entry level requirements. There's a reason that many penetration testers start off by working as systems administrators or developers for a few years before they start pen testing....
Plus there's only so much spoon feeding that we are willing to do - the onus is on you to do most of the work and the learning. Anyone who is any good at penetration testing has this attitude and has put in the hard yards to learn what they need to be successful.
Yes, but you also said "I will be using this method for work purposes fyi, when im at work." which is what made me (and others I expect) suspicious. If you're not a systems administrator I don't see any legitimate reason for using backdoor techniques at work for work purposes.
Start by following some of the posted tutorials on the site, but make sure your victim system is the same patch level as the victim system in the tutorial.



