Just so you're aware, the regular Stage 1 tunes do not require an intake at all. Only Stage 1+ and Stage 2 require the high(er) flow intake. R8 coil packs (and the accompanying spark plugs) are definitely a must, as you're almost guaranteed to blow a stock coil and misfire. The install is insanely easy, so don't worry. HS Tuning sells a well priced kit that gives you all the parts you need. After some research, I personally went with R8 coils and BKR7EIX spark plugs.
As for the clutch, there are a lot of different options there. The HS Tuning RSR is a great clutch, though a little on the pricey side. I personally run the same clutch, just pieced together in DIY form to make it about $4-500 cheaper. The stock GTI clutch is good for 250 lb-ft, so Stage 1 alone blows past there. My recommendation is to see how your clutch handles the power first. If you start to slip, then you can look into getting a new clutch.
Also, for the record, you won't need a high pressure fuel pump or a cam follower, as all MK6s run TSI engines. Those mods were only needed on MK5s with FSI engines.