Looking to be first time home buyer

I am looking into buying a home in CA for about 250k or lower. I will be buying with two other people I have no idea how this process works or where to start. We have a down payment covered but what other fees may there be in the buying process? We also have family that are homeowners and i've read you don't necessarily need a realtor but how does the process work without one?

Do we need a realtor?

Do WE directly pay for a realtor or is it a percentage of the home by the seller?

What do the fees look like for inspections?

How do people try to f other people over in buying?

Are there fees most people don't realize until after?

How do we tour homes from online/zillow?

Really ANY advice is very helpful! Thanks :)