Learn French: Je suis une femme.

In French, all nouns have a gender (masculine or feminine). Because femme (woman) is a feminine noun, we have to use the feminine word for 'a', which is une. If we were talking about a man, we would use the masculine word un (un homme).

How is the word femme pronounced? It looks like it should sound like 'fem'.

It is actually pronounced more like 'fam'. Even though it is spelled with an 'e', the 'emm' part in this specific word makes an 'am' sound in French.

If a man were speaking, would the word suis change?

No, suis stays exactly the same! The verb être (to be) changes based on who is doing the action (I, you, he, she), but not their gender. Both a man and a woman will say Je suis.

Is the word Je always capitalized like 'I' in English?

No. Unlike the English word 'I', you only capitalize je when it is the very first word of a sentence.