i was wondering if there was a kit online somewhere that i could buy that just plugs straight in, i dont want to be cutting and soldering wires. thanks

Do you have c/locking & want to make it remote? or you have no c/locking and want it? If it's the first then Rclick do a kit that you just unplug the wiring from the pump in the boot and their unit plugs into the connector and the pump, then you have remote c/locking. If it's the second, again Rclick do a universal kit but that involves a bit of wiring and some mechanical connections inside the doors etc

i think my car has central locking, when i use my key all doors unlock and a noise comes from the boot, i want to make remote

OK then have a look on the Rclick site and they will do a kit that you just unplug the connector on the pump in the boot and re-connect it to their unit and you'll have remote lock/unlock :)

is it as simple as unplug the old and plug in the new and it works?

Yep, unplug the connector going to the pump unit, plug that connector to the Rclick unit & plug the lead from the Rclick unit to the pump and hey presto you have remote c/locking :)

does it matter which one i buy, like does it have to be a specific one for my car?

If you look on their site, it shows the one for 6N2

is it that easy cause i fitted one yesterday and had to splice cables and attach cables from the module to make it work, and the noise from the boot is the central locking pump.