I'm planning to do the same as you.
1. Bosch 0280 158 040 upgraded 925-980cc injectors (the factory MPI injectors don't flow enough). Available with CTS kits, or you can buy from online race shops. Precision Raceworks sells them flow matched & modified for optimized spray pattern.
2. 06L 133 201 AH - ROW intake manifold. Your fuel rail will bolt right in, no need to drill your stock NAR manifold.
3. Low pressure fuel pump. Your options here are Precision Raceworks or CTS, both of which involve CAREFULLY drilling out the plastic welds in a factory fuel pump basket and some dremeling...or if your pockets are full and you don't like DIY, PagParts. You don't need IROZ.
4. Ethanol sensor. OEM or aftermarket (Fuel-It, among other options)
5. Harness to ECU from Precision Raceworks, APR, or CTS (PR can be purchased separately from their website or BMPTuning)
6. AEM 5bar MAP sensor if planning boost over 30psi. Forum mod 2slowvw sells a harness for this:
https://www.golfmk7.com/forums/index.php?threads/3-5-5-bar-map-wiring-harness.362704/
7. Fuel T (5/16" ie. 5AN unless you're planning to use upgraded aftermarket 6AN fuel lines)