Greetings to all!

I would like to ask a few questions about the E-ticket of Turkish Airlines.Recently i bought a ticket from Turkish Airlines and i realised that it is electronic.This is the first time i will be using an electronic ticket and flying with Turkish Airlines so i right now i am a little confused.

After i booked the flight they send me an email with title ''Turkish Airlines Online Ticket - Information Message‏''.In the email there is my reservation code,the ticket number and the flight number.The email also says that my ticket has been issued as an electronic ticket and that i will not receive a paper ticket.

So that means that when is the time to board on plane i don't need to have any papers with me?Only my ID?The strange thing is that when i go to the official site at the online services there is an option that says ''View my E-ticket''.There i can see a document that could be used as an actual ticket.Don't i have to print that?

One other thing is that there are many check-in options and i am confused as to which i should use.There is the self check in option which i dont think i could use since the airport from which i will depart doesn't have a Turkish Airlines machine.There is the check in online which says i can check in 24 hours before the flight.Also i think i can check in on a desk at the airport right?Are all the check in options the same?

Last thing i want to ask is about my baggage.My ticket says that i have the option of Free Baggage Allowance until 20kg but it doesn't specify if i can have it with me on my cabin or i should leave it at a drop desk.If i remember correctly when i was booking my ticket i didn't even had a choice

Sorry for the many questions but i am really confused......