Hello,
First off, this bid is just to let you know that i do not believe what you are asking will be possible unfortunately, let me explain.
My name is Andy, i work for a large company that provides virtual servers, dedicated servers and shared web hosting - much like crazy domains. Magento is a rather resource hungry application and does not play well with shared hosting due to resource limitations.
Though this is not your issue currently, the error you are getting suggests that the pdo_mysql extension, which magento requires - is not installed on the shared server you have been placed on.
There is nothing anyone on here can do about that and it is likely crazy domains will not install it for you or at least without an awfully long wait (change processes etc).
Furthermore, with an e commerce site you will probably want an SSL cert, not usually possible with shared hosting either :(
Really you would want your own virtual server, a little more money and a fair bit more responsibility but a much better experience going forward.
I suggest the following:
Contact crazy domains and clarify whether or not the php extension 'pdo_mysql' is installed on their shared servers, if not ask them if they will enable/install it and how long it will take.
Also ask them if magento works on their servers.
If the answer to either of the above is no, then a virtual server is what you will want/need.
Let me know if you have any other q's as i am running out of characters.
Andy.