This is really great device You reminded me of my first reaction when I got this phone. Dont worry and you should start reading some topics first

For the smileis you can download alternative keyboard for input with moded buttons specialy for smileis I recommend you the Smart Keyboard Pro i thinks it is really the best keyboard ever released
Link :

And don't worry and ask

 

I love the HTC_IME keyboard for the X8, a guide is in the sticky at the top of the forum but for texting then download the Handcent SMS app free from the market. Next to the text input box there is a lightening bolt symbol and if you tap this you get Smiley's and loads of other options. It is a great texting app in its own right and one of the few that I would really not want to live without!

The other way to do it is long press on the 12?! button second from the left at the bottom of the keyboard and you will get a pop up screen of smilies.