maybe you say it in English like: there are trees! but in Persian you need to say something like: there are "some" trees! / there are "a few" trees. (with some preposition) this "ی" performs like this like "some" and you need to use it. and you say there is no street in front of the home but in Persian you need to say something like: there is not "a" street in front of the home. this "ی" performs like "a".

چندسال پیش شروع به یادگیری زبان فارسی کردم، تا تاریخ ایران را بهتر بشناسم (به جای" تا" از "برای اینکه" یا از " به این منظور که" هم میتونی استفاده کنی)

The first one is a present perfect form, and used for present and something it has effects in present, The second one is a simple past form, and used for something started and ended in the past, Though you can take a look on grammar websites.

Nope! You should drop the comma, I guess!

I love you baby/honey

I love you baby/honey

If people are there: taken, not free, No people: not ready, not cleaned I guess!

your sentence is OK! but it would be better to say: " panj sal tool keshid ta mohandes besham/shodam"