Need more accurate info...
1. Your current study permit expires but when does your current College course expire (date)?
2. Yes you can apply either to a new course or if your current study permit expires BEFORE completion of present Studies at the new college than yes (unless your Country of origin has some specific rules), what Country are you from?
3. Financial Documents need to be provided as per CIC check lists, but yes as long as you can show you meet the Financial requirements Bank Statements etc should be OK from your Country.