New android user

Hi everyone this is my first time posting on the forums and i just got my first android phone (razr hd xt925). I had a blackberry before and the OS is completely different and it is kind of similar to my ipad. So i have a few questions.
1. Is their only one place to get apps, the google store? And i downloaded a game but said i need flash player for it, is their any way to get it since its not on the google store?
2. My preloaded email app is terrible, its called "Email". It only loads my emails i got before July 7th and won't recognize any new ones. The preloaded gmail account works fine though, but i have a hotmail and gmail i use and id like to have them both in one app like on my ipad.
3. Do i need my preloaded bloatware from fido? whenever i click on them it just links me to a site to buy games/music/wallpapers/etc. The only one i think is worth keeping is the one that links to my account.
4. And do i have to be careful with what sites i visit and what i download or is android pretty secure.

Thanks for any help and advice.

edit:
5. Is there any way to find out what applications are still running and close them, similar to double tapping the home button on the ipad.

 

Alright that seems simple enough, thanks for your help.