Yea. No offence. You can google any of these terms or do a search here or look up a guide on whatever task your asking about.
It's not that we dont want you to learn, we do. Just it's a level of mechanical work that is risky with out any mechanical knowlage or skills. Please. Go ahead and try. But if this car is important to you getting to worker your not willing to take the risk, have somone who is qualified to work on TDIs take care of this for you.
TDC is top dead center and refers to the timing marks on the engine.
There is only a few ways to learn how to do this stuff and they all require that you try and do the work weather you got a $education or the school or trial and error.
I would love to hear that you tried doing the work but if this is important to you and you cant take the risk of it not running, have a pro do it. There is a page here on our forms on trusted tdi mechanics in your area. Please do not go to the dealership or some shop that is not qualified.
If uou do want to learn and take the risk of destrying the engine( you wont if you ask before breaking things and listen to our guides) by all means lets have you do a timing belt job. You need a few speciatly tools (most can be made) you dknt need fancy sockets and wreches but you do need a very $$$ cable. Its called a VAG-COM cable and you an buy them from rosstech or used on ebay. Look for an old one that has no VIN limit. Usually about $120 is a good sale price, 95 is a deal. 300+ otherwise for newer stuff. You need a laptop for this as well.
If your up for doong this job and you have no tools, about $700 should be enough for cheap tools, a cable, the belt kit, and a few beers when your done. Probably less. Tools are an investment so.......