You can edit the copy on your contact page just like any other page, so you can give whatever contact details you like – phone, email, etc.
But your contact page also comes with a contact form, like the one below. When someone uses it to send you a message, you get a copy sent to your email.
If you like, your sidebar can have a photo with a short piece of welcome text. (But if you're as camera-shy as I am, don't worry - it's totally optional!)