femi,
As for the second question, open your materials editor (under the project menu in my work environment). There select a material closets to what you want just to speed things along.
Important make a duplicate of this material and give it an appropriate name. Then you can change around the settings for transmittance and attenuation to get the appearance you are wanting.
You might also want to look in the manual page 26 and in the help under materials
HTH
Erich
AC 19 6006 & AC 20
Mac OS 10.11.5
15" Retina MacBook Pro 2.6
27" iMac Retina 5K