Hi Mac
With a first degree, and then a Masters, you have a reasonable chance of getting onto a PhD program.
However, you do need to think very carefully about the kind of PhD you want, and why you want to do it.
The amount of time studying is considerable. Will you be doing it for love of the subject, or because it might increase employment prospects?
It is pays to be practical, and to keep these things in mind. There is a considerable over-production of PhDs, and not everyone wants, or will get, a job in academia. What will you be hoping to get at the end?
Letters after your name are very nice, but the rent still has to be paid.
Angelette