ANDROID: Are These "Ways" Legal? Pictures, font's etc

ANDROID: Are These "Ways" Legal? Pictures, font's etc

I am a newbie programmer at android and this is my first android app. So I
am almost finished with my first 2D android game, and I was wondering if
the things/ways I used are legal or not?
Pictures:
1) I created almost all pictures by myself on a free software called
Paint.net. I actually used their features (you know, all that distort and
blur stuff) and I was wondering if that is legal or not? (all the idea was
mine and i used paint brushes and text to create them)
2) I made most of pictures by myself except one, which was a space
picture, and thus i used one from a free website that gave free pictures
--> LINK Is that legal?
3) FONTS : I used a couple of fonts using Microsoft word, called Snap ITC,
Script and Times New Roman. I have never installed any additional font's
thus these were already in my Microsoft word. Are these legal to use?
4) Since this is my first app, I have decided to make up a random company
to write on my splash page of my android app. But when i researched, I
found out that there was a company called exactly that, that made
footballs in Australia. Now can i use that name or is that illegal?
5) I also used Microsoft word, and their software to create "WordArts"
that I am using in my app. Is that legal?
Thank You so much for helping this 15 year old android programmer.
Thanks