I need advise on what to Purchase

Hi @Bumper985,

SmartThings is a good start for Home Automation and Home Security.
The great thing with ST platform is that you can mix and match devices from different companies.

ST hub V2 will have camera support, but not at lunch in a few weeks.
ST Multi sensors are great for Doors/Windows.
ST Motion sensors are great for home security.
ST Presence sensors can tell you if your kids or family are home.
ST FortrezZ Siren

If you want a door pad to arm and disarm the system, you can do that by installing an app on a Tablet from ST and you have a secure keypad. (SmartTile.Click)

Check these for Mounting the Tablet and the Dashboard app: