No problem, it's my pleasure.
You do have unique circumstances, however just because you aren't doing what everyone else is doing doesn't mean it can't be done! Once you've established a budget, the most important decision is going to be where you decide to hold your ceremony. Just because most brides get married at a resort doesn't mean you have to. Jamaica has beautiful private villas and homes which are available for weddings as well. In a private villa or home you can do as you wish and they often work out very affordable for families, as they have lots of seperate bedrooms or apartments.
An all inclusive resort will most certainly charge your guests for a day pass to attend the ceremony, but this will give them access to everything the guests get... Meals, drinks, included activities, ect. These usually start at about USD $100 and go up (sometimes way up!) from there. If you are looking for a private reception after the wedding they will most likely charge you per head in addition to this, especially if you have a special set up and plated dinner.
I've also ran into the problem where resorts will only allow a certain number of "off site" guests attend, so clearly you want to find a property that will welcome local people.
A resort that is not all inclusive will most likely allow your guests to attend for a minimal charge, if anything at all, but the costs for your ceremony and reception may be higher. I'm speaking generally here, literally every property on earth has it's own rules.
Hope that helps! Sounds like it will be a lot of fun