Vespa ET4 Leader 2001, service/tune/parts replacement

Hi, I brought my wife a 2001 Vespa ET4 with 29,000 km on it. We are first time Vespa owners. First problem is that it takes a lot of revs before it starts moving, can anyone tell me how we can change this, we want to have good throttle response. Also with the amount of Km's on it what should I be replacing/servicing/& inspecting. I am also planning on doing a re spray 2 tone, I I'll post photos during the process.

any help would be greatly appreciated, Thanks Adrian