Start out with Friends and Junior Models

[Philippe Hurbain]

60616 Glass Door For Frame 1X4X6

Exist in two versions as unofficial parts on parts tracker
http://www.ldraw.org/cgi-bin/ptdetail.cg...60616a.dat
http://www.ldraw.org/cgi-bin/ptdetail.cg...60616b.dat
Most probably will be in next official library update...

10314 Brick 1X4X1 1/3. These should exist.

Indeed missing. Most probably you can use the very similar 6191.dat Edit: now available as unofficial parts on parts tracker: http://www.ldraw.org/cgi-bin/ptdetail.cg.../10314.dat

I just do not know how to find them.

Out of curiosity, what software do you use to create your models? Search is more or less easy, LDCad is very good (highly recommended!), LeoCAD is OK, MLCad quite bad (not recommended at all!)