To start using Traccar Server follow instructions below:
For most devices you should use IMEI (International Mobile Equipment Identity) number as unique identifier. However, some devices have vendor specific unique identifier, for example TK-103 protocol devices use 12-digit identifier. Note that if your device is called TK-103, it doesn't mean it uses protocol that's called TK-103 in Traccar.
If you don't know device identifier you can configure device first and look at server log file. When server receives message from unknown device it writes a record containing unique identifier of new device. Look for records like "Unknown device - 123456789012345", where 123456789012345 is your device identifier.
To host Traccar server your computer must have public IP address. Most ISPs provide such feature for extra fee. Your public IP is 18.104.22.168.
To select correct port find your device in the list of supported devices. If you own a cheap Chinese GPS tracker please read this information. Port column of corresponding row contains default port number for your device. If you want to use different from default ports you can change them in the configuration file.