Mo_1987_R

Hi guys I have had time and been working on my project through lockdown...I have got a golf 1.4tsi which we have fully converted to a golf r... we are currently working in the 4wd conversion...engine wiring virtual clocks are in....don’t have keys and ecu....now how do I go about this all I know is it’s 2017 mk7.5 tsi engine manual and loom whole running gear apart from the ecu and keys set? what do I need is there more than one ecu I need? And how would I go round to coding it and making it work? please guys any help would be appreciated as right now I feel I am pissing in the wind with a engine in car which may never work? 😕 regards