Maloy

Hi everyone , I'm after putting 16" Schmidt modern line 1pc on my 16v being new to the corrado game I'm not sure on what size would be best to go for ? I will be lowering the car on coilovers and was hoping to get the wheels in 16s sizes 7.5 up front and 9s on the back . Is this ok and how much work will this involve ? Also can anyone help me in the correct size tyres to use for a little it of stretch Thanks