Some F.A.Q are on the comment section, so im doing that short guide here:

How to get your first computer parts ?
Machining table -> Search for computer components. It will use a pack of component to get one computer component
How to get your first titanium units?
Buy it from some special traders, or mine it
With the titanium, build your first electrolizer to get your own titanium production
To get alpha poly and beta poly ?
Youll need the Matter Fabricator, wich need most of the ressources wich can be created by the electrolizer, and some ressources created by the Robotic Assembler. The robotic assembler can also be created with ressources from the Electrolizer.

You now probably have all answers