This is by far not a complete list, but a solid start:
Engine Build Components
First step is to budget & determine what you want. Find your shops & tuners who have the experience and are willing to do the work properly. I would also suggest contracts on a larger build, not really for timeline (delays happen) but for legal reasons if they fail to deliver what they agree to. Hate seeing someone drop 10k+ on an engine and it blows and come to find out the shop scammed them or used lower quality parts.