Reply to your first question:
मैं अंग्रेज़ी बोलती हूँ - Main angrezi boltee(ii) hun.- I speak English.(A speaker is female)
मैं अंग्रेज़ी बोलता हूँ - Main angrezi boltaa hun - I speak English (A speaker is male)
Yes, you are right.
Reply to your second question:
Your question is not quite clear. You have to give the whole sentence from the lession.
Example of masculine nouns ending in aa:
लड़का -laṛkā = boy, पिता - Pitā - father, संतरा -santarā -orange
Example of feminine nouns ending in ī(ee):
लड़की- Laṛkī=girl, रोटी-Rōṭī=bread, बेटी-Bēṭī=daughter
Exception: माता - maataa is ending in aa, it is feminine.
पानी - paanee(ii) ending in ee, it is masculine.
You just have to memorize them.