For someone who is new to electronics, you picked a PIR sensor that is very difficult to use.
A simple PIR sensor would have one pin as output. This sensor has a microcontroller inside.
Are you sure you want to continue with this sensor ?
According to Application Note AN0307 (read it a few times to understand the sensor) it seems possible to use it without interfacing with the microcontroller. See Figure 2 for a simple hardware schematics.
The 3.3V can be provided by a Arduino Uno. You need three 100k potentionmeters. You don't need the Solid State Relay at the /MD/RESET pin, since you don't want to switch something on the mains power. So instead of the Solid State Relay and the 680R, you could connect that pin to an input of the Arduino. I'm not sure if that /ME/RESEt pin is open collector, so perhaps a pull-up resistor of 4k7 to 3.3V is needed.
If you want to interface with the microcontroller in the sensor, you have to follow the flowchart, and the example software. This is very difficult for a beginner, so you might have to hire a professional software designer.
The hardware needs some level adjustment, since the RX and TX pins of the sensor are for 3.3V levels.