sprocket modified

So I am busy looking for chains and sprockets for my bike. My question would apply to mods and upgrades as it involves changing sizes of parts. So I read going down in size of front sprocket speeds you up and up in the back makes it more faster. This is not he part I was wondering about...

I am looking to change my chain and both sprockets on my bike. I want to get a better launch off the line (top end speed absolutely does not matter to me, I don't need 140+ speeds at this point in my life lol) so I was wondering if there are any "all in one" kits out there that I could purchase...