Hello!

1. Йй. Its name is "и краткое" (ee krUH-t-kuh-ye), "short "ee" in English.

2. Ьь. Its name is "мягкий знак" (mYA-kh-kee-y znUH-k), "soft sign" in English.

3. Ъъ. Its name is "твёрдый знак" (tvYOr-dy-y znUH-k), "hard sign" in English.

4. Ыы. Its name is "ы" (YH); it's a Russian vowel that doesn't exist, for example, in the English language. Listen to it in some words:

сын (sYHn), "son" in English; дым (dYHm) - "smoke" in English.

5. Бб. The name of this letter is "бэ" (bEH), the sound is similar to the English "b" sound. "Бб" is a consonant. Listen to it in the following word:

бОмба (bOHm-buh) - "bomb" in English.

Richard, to read more about "ь", "ъ", "й", please click on this link:

Ь, Ъ, Й