The reason it didn't recognize the meaning that it only wrote the pronunciation or syllable of that word:

ki = キ
mi = ミ

So, when I study the language how can I understand the meaning of the word?
and why didn't google translate it?

And you say in a few years I wil be better than Google!!!!
In a few years!!!!!???
Will it take that long??!!!!

Lotta words except a simple "Thanks!". Just compare my translation with Google's and ask yourself if 「キミ」 was the only problem Google had in translating the whole phrase.

FYI, it was not only 「キミ」 that the original gave you in kana. In fact, it gave you all the words in kana. Thus, your reasoning fails.

Well,
How would you advice me?
How to start learning the language?
Where to start?
I already knew that first I should remember the Hiragana and Katakana letters..

To be fair, you couldn't have actually expected to spend a few months and be better than a computer with near limitless storage capacity...

Edit: Although I guess that's not completely fair. You will probably never be as good as Google at recognizing some vocabulary (I still have to use Google to pull the definitions of some words after I've completed a crossword puzzle (I always forget the meaning of words like "vale" and "dale"—one means "valley" or something, I think)), but give it a year or two and your grasp of grammar will be better, too (to the extent we can say a computer has a "grasp" of grammar).

You are talking to me like I already know everything about the language..!!!
I just like to start learning it, and therefore how do you expect me to ask myself and know the meaning of the phrase??!!
How even I am supposed to know if it is even a phrase??

And see!! at the begining you didn't even welcome me in a nice way, you just instantly gave me this reply: Simple. Study your butt off.

And I am just a new member here and would like to learn this language..

Would 三日三月 be the correct way to express the 3rd of March in kanji?

flip it: 三月三日
Japanese goes "most significant to least significant" (YYYYMMDD).

There are a billion threads detailing how to start learning Japanese; it's the second most common question asked by people with less than ten posts, behind only "I want a tattoo please translate hope/chastity/virtue/Zen." Try the search function on this page. It's at the top. Then, if you still have questions, please ask again.

And welcome!

Would that hold true in 'conversation' as well? If I were to say, "I'm going on the 3rd of March." would it still be flipped? Or is the flip more for official purposes, such as dates? I know in Europe it's dd/mm/yyyy, while in the States it's mm/dd/yyyy. If Japan is yyyy/mm/dd, is that only when expressed in numeral fashion or is it in Kanki as well?

I can't recall having ever heard anyone say the date before the month ever. It's always 三月三日に行くつもりです or something similar.

Is it possible you've encountered the set phrase 三日三月三年（みっかみつきさんねん）?