Greetings, Howard.
Where are you and your son located (state and nearest big city, if you will)?
One quick word of advice (there’ll be a bunch more from all is here), I realize you’re eager to make yourself known to others, and earnestly want to immerse yourself in games. This advice applies for you, and especially for your (minor) son – when you commence a plate meeting, unless you know the coaches personally, use only your first name (or a nickname, if you use one) when introducing yourself, and you are under no obligation to give them your experience or credentials or newness to the umpiring profession.
If you give your (full) name, there will be a coach somewhere, someday, who will look you up (online). There is a temptation and propensity of theirs to conflate your umpiring – no matter the contextual level – with your personal or other occupational life. So too, your son, when he’s inside the fence as an umpire, should know that he has the authority to address the coach(es) by their first name, or by role (ie. Coach).
On the experience front, the amount of time (or lack thereof) you’ve spent umpiring, or how new you are to “X” level, in no way affects or erodes your authority. You might not know all the rules comprehensively (there’s a lot to know!), and your experience does shape and affect your judgement and discernment, but again, not your authority. Do not allow a coach to upset or undermine your authority based on something like, “Howlongyabeen doin’ this?! A week?!”
Glad to have you (and your son) aboard!