So you wanna learn Japanese? That's great!
Don't fall into the romaji trap! Japanese written using the Latin alphabet is called romaji. You can use romaji to learn the Japanese kana syllabaries hiragana and katakana. After that you should get rid of using romaji as soon as humanly possible. There are two reasons for that: One is that you need to become literate as soon as possible. Literacy is key to efficient learning of any language - and even more so Japanese, which literal form has some quirks (to say the least), that are reflected in the spoken language too! The other reason is that it'll make your spoken Japanese sound more natural. Maybe I'm just imagining, but I think I can tell when a foreigner has learned Japanese through romaji from the way he/she is speaking.
Make sure you have a good Japanese dictionary and kanji dictionary. They're indispensable for your learning progress. Your goal is to learn the whole Japanese language, right? So every time you see a word or kanji you don't know - look it up, write it down, and study it.







