I mate, as your a newbie i'll be gentle. This topic has been covered alot in the past, so the best thing you can do is use the search button. Search for ko3s and ko4 or even ko3s hybrid. Ko3s will be a straight swap over, but you need supporting mods on to get the most ou if it, like a full turbo back exhaust, front mount intercooler(fmic), new turbo intake pipe, uprated dump valve and a better air filter. Do all that and you'll get anything from 220-240 depending on what RR your on. KO4 is not a straight swap and needs alot more work to make it it. Search that.
OR
What very popular at the moment is a ko3hybrid conversion. Is uses your current turbo and uses the internals from a ko4. Need suppoting mods and, new injectors, manifold,fuel pump and a few other bits. That will get you between 270-290bhp. Search and all will become clear!