You deposit your week at your home resort with RCI and in exchange you have 2 years to make a request for the time you want. RCI has MANY restrictions and RCI will let you know if your requested time is available. To request time you can call in or you can use their website. There are many threads on how peoples experience with RCI has been... not good!
RCI doesn't have "MANY restrictions" nor are everyone's experiences with RCI "not good" . . . and you may actually have more than two year's to make your trade, depending on when you deposit and when your week is.
In the case of the OP, if we are talking about 51/2007 and they deposit now, they would have from now until 12/31/09 to take their exchanged week trip (making it over 2 1/2 years to travel). They could also request (and pay for) an extension should that be necessary to buy more time into 2010 to use their exchange week. The actual policy is that you can exchange for up to one year before the date of the week (if you deposit that early) and two years after the date, rounding to the end of the month.
The restrictions do exist but generally speaking they are known in advance, if you read your membership materials and the fine print.
My personal experience with RCI has been very good and I've been able to get to the places we want to go when we want to go there. It does require some advanced planning, and sometimes flexibility on what resort you will accept in a given area. If you are looking for a trade online, your confirmation is instantaneous. If you are working with a VC on the telephone, you will also know immediately. If however, you need to enter an "ongoing search" it could be days, weeks or months . . . or never.
As for trading the week in question for a summer week in Orlando, I'd say as a general rule of thumb, that should be a pretty easy trade so long as the OP doesn't have their hopes set for a primo resort. Orlando has considerable inventory and is rather easy to trade into so I don't know that I would use that as a guide as to the "value" of the trade you will experience in the future.
Also the trading a white week for a red Orlando week is an example of how the "RCI rules" don't always play out. They typically tell you you can expect your week to trade for like inventory . . . in terms of "season" and unit size. I have had my red studio SC, trade for a red 2BR GC . . . so as you can see, it doesn't always work exactly as they say it will. In that example it was my Hawaii unit trading for an Orlando unit in the very soft season albeit red.
You haven't really said what types of places you are thinking you would like to go using this new TS for exchanging. Do you know yet or are you simply exploring all of your options?