Mashallah. You Need To Know Basic Of Quran And Islam, You Don't Need Witnesses, You Will Have To Choose A New Name, A Islamic Name. For Further Information Go To This Site http://www.muslimconverts.com/ Inshallah, This Will Help You.

Just Say The First Kalma The Meaning In English Is Written.

bear witness that there is
no deity (none truly to be
worshipped) but, Allah,
and I bear witness that
Mohammad is the
Messenger of Allah