N A I V E - M U F F I N
Should I learn Hiragana, Katakana, or Romanji first?
Which should I concentrate on more or should I do them all at once...?
Yea. I'm trying to learn on my own...
And when I'm able to take a language in highschool, I'll learn more there. Please share your opinions Hiragana first, then katakana, then while learning grammar and such learn Kanji.
Roumaji (no "N" just to correct you)ローマ字 is the letters you're reading right now. English, Italian, French, Spanish, etc... use them.
If you mean learn words using it first I say don't. Hiragana and katakana are the syllabaries and get you started on the language. You'll know what sounds are a part of the language, and you need to know those for kanji and everything else.