Hieroglyphics are symbols which represent sounds. Each hieroglyph may represent one or more sounds. To make a word, simply use the hieroglyphics to phonetically spell the word, then put the words together to make sentences.
Unfortuately not. Egyptian is a different language, like French or Russian. Hieroglyphics are simply the alphabet that Egyptians used. Because their alphabet is based on sounds, we can use it for any language, not just Egyptian or English.

1. Write the sentence normally in English.
2. Write the words in your sentence phonetically (how the words sound).
3. Using the hieroglyph alphabet key, select the hieroglyphics which correspond with the phonetic sounds in your words.
This is how I spell my name with hieroglyphics: