Hi @AJ,
Welcome to the forums!
Have a search about, there are plenty of topics and advice around prostrate, whether massagers, dildos, whatever.
As mentioned, the biggest part of prostrate pleasure is relaxation. Like @mikeormick said, book some time in where you won’t be disturbed, have a bath, meditate, whatever to get you nice and relaxed, and allow time. It is a process, there isn’t a quick fix of do this and you’ll be reaching for the stars.
One of the good guides I found on here that may be worth a read is this post: