macOS Creating a program to perform certain actions

Hi, Im trying to figure out a way to create a "automation" or script that will perform certain actions when certain criterias are met.
The task i want it to perform is to fill some forms without me having to be there. It is about filling in forms for a first come first served basis apartment. These are only released maybe 1 a week so i cant stay and monitor it myself and as thousands of people are trying to get them the odds I'm first are slim.
The first action i need it to perform is to monitor and look for a symbol that appears next to these apartments in the list of apartments for rent. When this criteria is met i want it to click the link and fill in my name and social security number and accept all the terms and conditions. If possible i also want it to only do this to certain apartment names. ( correct area in the city) If it manages to find a apartment and book it i would also like it to send me a mail as i then only have a couple of hours to sign the contract.

Any ideas what kind of program i should use and any tips on how to do it? i have never programmed before so beginners instructions are preferred.