How long does it take to level up now and will I have to wait for Outland because I'll be max level when I reach the content for it or I won't even reach the required level until it launches ? Same thing about Northrend continent. I'm new to WoW in general.
Depends on realm you chose. As far as I understood, its like 3 weeks till Outland comes out on Lordaeron, on DW/RAG Outland and Northrend is available already.
I just leveled a paladin on deathwing and it took me about 22 hours. Lordaeron is 7x slower than deathwing so if all the content was realeased it could take you nearly a week to level up. As a new player it may take longer. The good thing is that everything is working on lordaeron and everything is new for you since youre new so it could be really fun! My advice would be to not worry about reaching the max level but instead have fun leveling and doing what you want :)