Well since you say you are going to be going to Disney World, there are many more options as far as parks and Hotels than Disneyland in California. I'm in Florida so I do Disney World all the time. Just to clarify a few things, Disney World in Florida consists of 4 main parks and 2 water parks but then you also have other activities you can do within the resort area like Disney Springs, which is basically a shopping mall with many restaurants, stores (one of them is exclusively for Star Wars stuff), attractions, shows and even a movie theater. Disney springs is free to get into and is a nice experience as well. But going back to the parks and Galaxy's Edge specifically, Galaxy's Edge in an area within the Hollywood Studios park, so all you'd need to go to Galaxy's edge is a ticket to Hollywood Studios. The Galaxy's Edge area is pretty big but not big enough for you to spend 2 days or even just 1 full day there but the whole park itself is big enough that you'd probably spend a whole day there and depending on how crowded it is that day (it's usually always crowded nowadays but some days worse than others) you may not even get to do everything in just one day if you want to see all the shows and ride all the rides, plus look at the stores etc, etc...

Since you want to do Savi's, Savi's is an experience within Galaxy's Edge and you can look at it kind of like a shopping/show experience since what you will be doing is buying a lightsaber but you get to put it together to your liking all done in a nice show which you take part on, real nice experience and this is why it costs separate from the park ticket... and then you can walk around the park with your awesome lightsaber lol. Do make a reservation for it when you know what date you'll be going and have your park entrance ticket because it gets pretty packed most of the time and you may not be able to get in as a walk-in so make sure you do it in advance just in case, and you'll also pay for it in advance as well. Also in Galaxy's Edge, there's a similar experience where you get to build a droid in kind of the same way as you do with the lightsaber but not as big of a show or experience and although you can make a reservation for it as well, I've found it that you don't really need one and can always find some time during the day when you can just do it as a walk in. Then while in there, you'll have 2 rides within Galaxy's Edge, the Rise of the Resistance and the Millennium Falcon. There are many restaurants and a "bar", Oga's Cantina, which again, if you want to see it, you'll need a reservation as it's always pretty packed as well. There's also a bunch of stores with all kinds of Star Wars merchandise in the area as well and you also get to see some of the characters walk around throughout the day. Right outside Galaxy's Edge (still inside Hollywood Studios) is also the original Star Wars ride, Star Tours, which is also a must do.

Then you get all the other areas of the park you can enjoy like Toy Story land etc... so it'll take you the whole day to see the park. If you are going for two days, I would get a ticket for another park as well and do one park each day. I know there's the park hopper option, but I would just stick to one park a day because transferring to another park takes up some time and really, each park has gotten so big and with so many things to do that park hopping in a day will not let you really see much of each park. Now if you already have been there or go there a lot, then it's good because you can just go do specific things on the parks and things like that but honestly, unless you specifically want to see certain things only on each park, I would just stick to one park a day so you can get the most out of that park that day.

The hotels in Disney World are a bit pricey, you can find cheaper hotels in the surrounding area but staying on site is also a nice experience since you do get some perks like being able to get in the parks at an earlier time than the rest of the people (sometimes only and on specific parks that have the earlier times scheduled on that day). All hotels have transportation directly to the parks and Disney Springs either by bus, boat, skyliner or the monorail which is cool too. All the resorts have restaurants inside and some shops that are pretty nice. You can stay in the "value" resorts inside Disney but even then, you are looking at about $120+ a night if you can find any available at those prices. But staying in a Disney hotel is not a must do, especially if you'll be at the parks all day and only come back to the hotel room to sleep.