What you would earn from your first job is dependent on different factors like your skills, your experience, the industry, and even the company that you are trying to get into.
One of the ways to earn a good salary in your first job is to acquire in-demand skills that employers are looking for in job candidates. Acquiring in-demand skills like programming, video editing, etc. will increase your negotiation power when negotiating the salary for a job.
Another way you can earn a good salary in your first job is to target multi-national companies. If you would like to work for such companies, you can follow them to know when they have a job vacancy.
Even if you do not get to earn well in your first job, you should know that you are in a process that can only get better. Keep learning to position yourself for better opportunities.