I have a feeling you meant to say "my first JAPH" with "Boku no ichiban ...". Unfortunately, that doesn't mean "My first...". So here goes a little lesson on Japanese... :-)

"Ichiban" is, literally translated, "number one". Which denotes "top", "best in a category", or "number one in a series of something". In this context you lack the something portion of it, so the phrase becomes a little confusing

You want to use the word "Hajimete-no" instead. That literally means "first", as in "I've never done this before".

( Even if you meant JAPH #1 in a series of JAPHs, it should probably be JAPH ichiban, as in JAPH no. 1 )