I cannot find the appropriate reading order of A song of Ice and Fire

[Scott]

A Game of Thrones is the first book. If you go that book's page here and click the series name at the top, it will take you to the series page which shows the order. You can skip the #0.5 book for now as it was a supplemental volume published much later.

For future reference, this isn't a group for such inquiries. It is for Goodreads Librarians who maintain the database, not regular real world librarians.