Two important reasons to study hiragana at first, katakana is a lot easier to learn after you have mastered hiragana. 1) Pronunciation. If there is one thing we want to get right at the start of learning a new language it's pronunciation, otherwise there is a painful path of unlearning. Learning hiragana helps with this, romaji actually makes it harder. When we see latin letters, our brain has already learned to pronounce those letters in a certain way, despite our best effort to keep our language out of Japanese. For example take the word karate, many would read this as kuh-rah-tee, and would've just butchered the Japanese pronunciation. Japanese actually does us a favor by having a separate alphabet. 2) It's already been stated, but you'll end up doing a bit of relearning. Which means it'll take longer in the long run, to reach your language goals, than if you were to start with learning hiragana. The order you study and learn things, I believe, is important, particularly if it is a long term goal. (Although I haven't quite figured out the perfect order myself, I'm learning too) I wish you the best in learning Japanese. Good luck.

Yes it's good but do it with fun. I choosed few japanese songs with lyrics. Converted them from kanji to hiragana. Rewritten them alot of times while i was singing the song slowly. There are also japanese novells on the web with mp3 file. Yes Hiragana and Katakana are the base for learning japanese.

Thank you all! I appreciate your help :)

Learn hiragana. Don't bother learning Japanese by romaji, it'll only set you back in the end.

It's something necessary rather that good or bad. Unless you study Japanese solely for speaking/listening and never for reading/writing, you will need it anyway.