1989 Jersey £2 Silver Crown

Nice looking coin - I have just seen it on ebay, presumably your win as it was £32.99 + £3.95 postage.

Difficult to say how well you will do with this. The low mintage, The Royal Mint manufacture and it being Silver with COA and box are all in it's favour. However, there seem to be few collectors for Channel Island coins except in the bullion market, and if after nearly 30 years it is still selling down at that sort of value, I doubt it is going to go crazy. A quick check on ebay shows a number of others for sale - all with higher Buy it Now prices (unsold).
Personally I focus on genuinely old coins rather than the modern commemorative and bullion style issues. My mantra is "If it was made to be collectable, it probably isn't" in the coin market at least. Some topics break this rule - if the subject crosses over into other collecting interests (Cats, Olympics - that sort of thing), or where there are blunders by the mint. (And I don't mean just poor quality control.)
Just my opinions...

No problem - I have time on my hands and there weren't many on ebay to choose from.

As to mintage figures and their relation to collectability: Just because a coin has a low mintage, that does not make it collectable. (That is what the marketing people want you to believe, but it is a con!) To be collectable, people have got to want it. To make it rare, the mintage figures have to be at or below the number of people who want it. With the Channel Island coins, as mentioned before, there are not many collectors, maybe only a few hundred, and so a mintage of 3000 is quite high. If The Royal Mint decided to make only 3000 of some special UK 50p coin, where there are millions of collectors, then the price would go sky high. It is the old economists rule of Supply and Demand.
I hope that helps!

That's a very big question! I am not an investor, so I may not be the best person to advise you.

Maybe if you stand back from it to see what your real aim is, you can see which approach suits you best:

If you are investing to put your money in safe long term assets that will keep pace with inflation and maybe show a small profit, then coins can work. The bullion side of the coin market is probably the easiest to follow, but you need to be buying at around bullion value. (Your Jersey coin would be around £10 to £12 on this scale.) Older coins take a lot more knowledge and experience, which means a far greater investment in time and enthusiasm than money.

If you are looking for a quick profit, then coins are not an easy way of achieving it. Yes, with knowledge, experience and luck you can make a big mark up occasionally, but most of the time you are making small margins for your effort.

If you are looking for the enjoyment of owning and researching historical items, then coins pay back in a big way (but not necessarily financially). The thrill of handling a coin that has several hundred years of history, with the quirks of it's story, manufacture and usage, is difficult to surpass.

I have made quite a bit of wealth from coins - but it is all tied up in my own collection. I have done it by getting out into the market - buying at auctions, flea markets and through contacts, researching what I have found and selling on the ones I don't want or are duplicates. It takes a lot more time and dedication, but the journey is a major part of the enjoyment. I now have a substantially valuable "investment" in coins that has effectively cost me nothing but time - which means every penny is profit. THAT sort of investment I understand!

I hope that helps!

Getting your sons interested early is definitely a good move. If you try out the local flea markets and antique centres they should find plenty of opportunities to pick up interesting coins very cheaply and so expand their interest and knowledge. After a bit you can try out some of the coin fairs, where they will see many more interesting, but also more expensive coins.
There are relatively cheap books available from Rotographics on Amazon that can supply background information.
There are very few serious coin collectors who did not start when they were young.

to the Community!