First, welcome to the forum!
Second? I'm moving this to the appropriate section.
The best place to find free apps is in Google Play. You can also check out Amazon and Getjar. If you're asking where to find paid apps for free? We don't allow talk about that here.
Remove icons from the home screens by long pressing them till the trash can appears then drag them into the trash. Apps that won't install are system apps. The only way to uninstall these apps is to root or get root access to your device.
I'll have leave the tip guy(?) for someone else to explain, as I can't help there.
, follow them and prosper!
Did you forget to kiss a Mod today?