Default signin and sign out links are,

http://localhost:3000/users/sign_in

and

http://localhost:3000/users/sign_out

To see what your current routes are, try following in console,

rake routes

To generate signout link in view, add following,

<%= link_to 'Sign out', destroy_user_session_path, :method => :delete %> 

Welcome to Rails man.

I know the community is all up on the devise gem. The reality is that Devise is an advanced authentication app that's a gem.

If you're learning, and you need authentication, some super geek named Ryan Bates hooked you up with a tutorial and screencast on basic authentication that will work exactly how you need it, and you will understand what's going on:

http://railscasts.com/episodes/250-authentication-from-scratch

WHABAM!

Be mindful that is based on rails 3. Check the differences between rails, and ruby versions if you encounter problems while following directions. If you do get errors, still, this path will get your further to deploying that app of yours.

Come back to Devise when you need the features it provides, Rails, and confident you can implement ideas found in the book 'Crafting Rails Application' by José Valim. He's one of the main contributors of Devise, so you'll get insight on his thought process.