Hi Ladyvalea,
I was on the Odyssey some time back. I'm sure Cap'n Lenny runs the same quality service now as he did then, and sets a standard for others to follow.
FWIW I believe sincerely you would be making a mistake by going to Truk, for the following reasons:
As a newbie you do not know what you don't know, as far as the diving goes.
This fact will make you hyper-dependent on your buddy/guardian angel.
It's okay for your LDS to state that he will look after you. But what about his dives? He will end up doing 25min dives when he should be getting 60min.
By the third day you will find he'll be asking you to sit out the first dive of the day as it is "too deep" and "long".
The crew of the Odyssey will welcome you aboard, then, after they have ascertained what everybody's dive credentials are, they will choose the week's itinerary based on that.
That will probably mean that the deeper wrecks such as the San Francisco will be out of bounds.
That may not please the more experienced members of the dive party. You might get to feel a bit awkward about it.
The diving, well, it's world class, warmwater, good visibility, but there can be strong currents running on virtually every dive.
You go off the back of the boat, then have to swim against the current, beneath the hull, to where the anchor line goes down to the particular wreck you're diving on.
You then swim/pull yourself down the line to the wreck where the dive begins. Do the dive, then make your way back to the anchor line for a slow ascent to the safety stop depth beneath the stern of the boat. There's a spare tank there. Sometimes they leave them on the anchor line, for after doing the deeper wrecks.
The Odyssey has a policy of Nitrox 30 for most dives. If you wanted a weaker mix, then you pre-order it.
I know, as a newbie, you have not yet completed a Nitrox course. So you may be told to breathe away, follow your buddy, and treat the gas as normal air.
If you decide to go on the trip I doubt that you will get the best out of it. By that I mean you will be too preoccupied with the basics of diving - breathing/air usage/depth/buoyancy/comfort - to be able to devote your attention to the reasons people go there. To see the wrecks. I mean to SEE the wrecks! Outside, inside, length, special cargoes carried, etc.
This happens 4 to 5 times a day. The fifth being a night dive.
At the end of the trip you will, no doubt, have enjoyed the experience, the place.
You will have paid top dollar to view Truk and what it has to offer, and you will probably never go back.
IOW you will MISS the real experience!
Enjoyment can be had for a tenth of that price nearer home. As others have said, the Carribbean. Where you can learn the skills through repetition in a friendly environment with, no doubt, a guide on hand to help you along.
And you won't feel one bit obliged towards the rest of whatever dive party is around.
I haven't mentioned safety. That's because the dangers in Truk visa/vie the warmwater diving are the same as in the Carribbean.
But in the Carribbean you can stay at shallower depths - to suit your air consumption. You don't really have that choice in Truk, unless you stay the dive swimming around the kingposts while the others are down below.
At the moment you should know how your last dives went. As outlined above, if you sincerely believe no compromise would have to be made by you while diving, then you're ready for Truk.
However, if even one change has to be made, such as "must try to do shallower/shorter dives to allow for extra air usage in the current" then Truk is not for you - yet.
It's going nowhere.
When you are well-practised in diving you will consider Truk a major location where ALL your dive skills can be used over the week's diving.
What I have posted is meant as a sincere message to you, and your son, for there's nothing worse than going home after a trip knowing that it could have been better "if only".
Choose wisely and stay safe.
Seadeuce
BTW I have been a nursemaid to newbies on trips, have been on fifteen liveaboards worldwide, and have seen quite a few locations. I say this so you know where my opinions are coming from.