Where does the TM symbol have to go?

The most conservative advice related to trademark marking usually consists of having an appropriate mark each and every time that the trademark is used.

What symbol can I use BEFORE the trademark is issued?

The ™ symbol, or a superscripted TM.

Can I add the ™ symbol to my website ?

Definitely Maybe. Trademarks do not protect websites directly. Trademarks protect consumers.