You can get started with a new IQ Panel 4 here:
Commonly users try to cover all access doors and first floor windows, and build out the system from there. Some users opt to install motion detectors to cover intrusion over large areas, rather than individual sensors on windows.
Consider glass break detection and whether or not you want monitored life safety devices; smoke detectors and CO detectors.
The standard IQ Panel 4 is compatible with 319.5Mhz IQ S-Line and PowerG sensors. You can mix and match as needed. Generally I recommend PowerG sensors.
S-Line sensors are encrypted sensors operating on the 319.5MHz spectrum. They have an operating range of around 600 ft open air.
PowerG sensors operate at 900 MHz frequency and use 128-bit AES encryption. They offer Multichannel, Frequency Hopping Spread Spectrum technology which allows the transmission to hop between wireless frequency channels, allowing for enhanced encryption. They also have a much farther operating range of 2000 ft or so open air. They have adaptive battery usage, so if they do not need the extra range they can save on battery life.
Surety users install their own equipment. We sell some Alarm.com cameras in our store. You can use any Alarm.com compatible camera listed here however: