how to install ssl on tomcat 7?

Question

I know this question might sound too easy and I should had read all docs available on internet, the true is that I did, and I had no luck, its kinda confusing for me, I have installed many times this thing but for Apache, never for Tomcat.

I want to install a certificate from GoDaddy, so, I followed this instructions

http://support.godaddy.com/help/article/5239/generating-a-csr-and-installing-an-ssl-certificate-in-tomcat-4x5x6x

I created my keyfile like this

keytool -keysize 2048 -genkey -alias tomcat -keyalg RSA -keystore tomcat.keystore
keytool -certreq -keyalg RSA -alias tomcat -file csr.csr -keystore tomcat.keystore

I changed tomcat for mydomain.com .. is it wrong?

I created the keystore, later the csr, after that the problem comes, I add to server.xml on the config folder

<Connector port="8443" maxThreads="200"
scheme="https" secure="true" SSLEnabled="true"
keystoreFile="path to your keystore file" keystorePass="changeit" clientAuth="false" sslProtocol="TLS"/>

Later I imported the certs

keytool -import -alias root -keystore tomcat.keystore -trustcacerts -file valicert_class2_root.crt

and I did, but I dont have a gd_intermediate.crt and the last step is

keytool -import -alias tomcat -keystore tomcat.keystore -trustcacerts -file <name of your certificate>

reading in other blogs I saw they import here the crt , but tomcat is the user I have to leave? or its for example only??

In the docs of tomcat I found this (http://tomcat.apache.org/tomcat-7.0-doc/ssl-howto.html)

Download a Chain Certificate from the Certificate Authority you obtained the Certificate keytool -import -alias root -keystore \ -trustcacerts -file

   And finally import your new Certificate
       keytool -import -alias tomcat -keystore <your_keystore_filename> \
-file <your_certificate_filename>

but I have no idea what is a "chain certificate" ... can somebody help me? I am really confused and lost. I am using Tomcat7

Thanks.