C-world Page 5

ok i haven't released a comic in 2 weeks so i finally just sat down and finished this one. The main reason for the lack of comics was the huge pile of school work i had to do, and a little extra inspiration in my religious/demon drawings, this one being a dog. Its pretty good, and if i get the chance ill put it up.
Also, please ignore the much apparent sloppiness of this comic, to any of my fans who draw comics, i would like tips on how to make my comic a little more professional. These are my 3 categories i struggle with:
Boxes-how do you plan these out, also how do you make them straight (obviously computers but)
Word bubbles- i just wanna know how some people create their word bubbles
Shading- i wanna know how you guys color in for like gray (as of now i just draw sketch lines through the gray areas) (materials used

basically i would like to know what computer programs you guys use and what kind of pens and pencils you use