>>943816There's a skateboarding thread there. You'll probably find better help there but I can answer.
>is building my own from parts best?Probably not unless you know what you want.
>decent board cost?You can get a Churchill Penny Killer for $75.
https://www.funboxdist.com/store/cruisers-and-street-boards/Check the rest of the boards on that page, pick what length/shape you like.
>Do they make security trucks with a loop for locking it up to something? No. If you're going for a small board, it'll be easy to keep it close by and keep an eye on it.
Have you ever ridden before? What distances do you plan on riding? The penny killer is 23" so it's pretty short, the cruisers are 28" which would be more stable at speed.