Handling raw LCD-TFT modules is not something you have any realistic chance of doing as a beginner.
First off there is no interface on the RPi that will match that of your LCD. Like yours, TFT-LCD modules have FPC connectors of 30+ pins sometimes upwards to 60 and that really all depends on the manufacturer.
Each of these pins need a specific signal in order for the LCD to work, many for 8-bit RGB data signal, some for synchronization clocks of various sorts, Voltage inputs, grounds, etc.
The only way of knowing which pin is what is to find out who manufactured that LCD-TFT module, then go to their website and download a PDF datasheet for it, or request one through their customer service.
So as you can see this is definitely no "plug and play" project
Some independant companies however, do manufacture driver boards for LCD's that will accept standardized signal input like RCA, VGA, HDMI etc. and will output to a FPC port specifically the interface your LCD-TFT needs, but the disadvantage is these are usually bulky (RPi size-ish), pricey ($20+) and relatively power hungry (probably draws nearly as much as the Pi itself).
Lastly, a 2,5" screen will present some apparent limitations for you,as it is a very small screen with low res, you will get very poor usability (pretty much impossible to navigate any OS, graphical or text based).