Need help with s13 coupe!?

Okay Im getting a 1990 s13 coupe.. And my friend like knows everything about cars and told to me to a ka24de with a turbo.. Is a ka24de a motor with a turbo it do I buy the turbo separate? I'm just trying to have my car have some power and he told me to get that I do have a lot of cash saved up soo getting that is no problem bc Ik it's super expensive.. And also if it is separate where do I go to put the turbo in my car bc I know for sure I can't do it and who can I ask what kind a turbo is right for that car like do I go a mechanic and ask? Lol I'm not a car expert I NEED HELP

whatever a cracked iphone 4 is worth, probably not much depending on if it actually works. There have been 6 iphones out since 4, so its way outdated.

Does a used Ford Focus make a good first car?

My neighbor is selling a 2005 Ford Focus zx3 ses with 102k miles on it. I think it's a great choice for a new driver because it seems like it's cheap to run, insure and maintain and is a good size. I like the hatchback because I take a lot of stuff everywhere. I want to get a job so I can try to be as responsible for the car as much as possible. It's listed for sale for 3500 dollars.
So is there anything I should look out for when buying a used focus? I think the seller is a mechanic. What questions should I ask him? We are a little unexperienced in used car shopping. Any help appreciated. Thanks.