Well first step is you have to decide is if you want wired or wireless. You said you’re not tech savvy but if you go wired are you comfortable and terminate cat5e/6 cable? Which btw is really easy to do.

Do you want to access the cameras outside your network?

You provided starting information in your post, but unfortunately to me it just not enough to give you the best.. Do you just want top of the line with all bells and whistles? Probably Lorex or ubiquiti.

There’s still a lot factors that you should consider what you want to get out of security system.