Transliteration and translation

[~Alessa~ 26]

Hello everyone! Have some questions about translation:

1. There is a little difference between transliteration of US department and my foreign passport. Like I understand, when I fill out forms I should use transliteration that recommended by US department? Even if I get new foreign passport, my first name will be the same, not like US dep. recommends. Just first letter of my first name though. But is it ok if I keep my current passport?

2. May I translate all of the documents myself (I found patterns)? Like I understand I only need to verify by typing text in the end of the document that I know english and Russian fluently? Or it’s necessary to use real professional translator and getting stamp from him (her)?

3. USCIS say “Any document containing a foreign language submitted to USCIS must be translated to English”. The thing is when I switched my skype from Russian to English version it still has some Russian letters there like mons and and days of weeks(( The year looks fine. Should mons and days of weeks being translated?

And evidence of meeting like zoo ticket (hotel receipt) should be translated too? by professional?