Many times when speaking to others either in person (at a hotel, at the airport, at customs, etc.) or over the telephone, we have to spell out words, especially our names.  So, today I’ll try to give you some help in this area.  First of all, here is how you pronounce the letters in the French alphabet:

a = ah
b = bay
c = say
d = day
e = euh
f = ef
g = zjheh
h = ahsh
i = ee
j = zjee
k = kah
l = elle
m = em
n = en
o = oh
p = pay
q = ku
r = ehrr
s = ess
t = tay
u = oo
v = vay
w = doobleuh-vay
x = eeks
y = ee-grek
z = zehd

If you want to double a letter, just say double __ like ‘nn’ would be doobleuh-en.
And here is how you say the letters with some kind of accent or sign:
à = ah accent grave
â = ah accent circonflexe
ae = ah-euh collés
ç = say cédille
è = euh accent grave
é = euh accent aigu
ê = euh accent circonflexe
ë = euh tréma
î = ee accent circonflexe
ô = oh accent circonflexe
ù = oo accent grave
û = oo accent circonflexe
ü = oo tréma

…is spelled ____ = Ça s’épelle ____

To mention a space between words/names, you say: plus loin or espace.
For capital letters, you say majuscule after the letter.  

So, for example, in a conversation where I have to spell François Mitterand, I would say:
François Mitterand.  Ça s’épelle ef  majuscule- ehrr – ah – en – say cédille – oh – ee – ess – espace – em majuscule- ee – doobleuh tay – euh – ehrr – ah – en – day. 

And that’s basically it for now.  So, enjoy spelling in French!