Any trained librarian should be able to help you determine journal tier ranking. Plus, they should be able to show you how to get the information yourself. Ask your university librarian:)

Note too that universities sometimes dismiss the the official ISI impact factors when considering academic performance and promotions. I know of one public university that rates local publications above peer-reviewed international ones! Go figure!!

Hi. Yes, many universities do allow graduates with first class honours to sign up directly to do the PhD program. However, note that in the British system, you would probably have to pass the MPhil hurdle first, before officially pursuing the PhD. You can also try Monash. I know they will give you serious consideration. But first be sure you're ready for the level of research required for a PhD. Good luck!