May I pop in and suggest you do learn Hiragana. Ignore Katakana for now and know that no one knows much Kanji...not even the ones who use it. The hiragana alphabet is very easy to learn and write. Speaking it is easy...if you understand how to speak grammatically. Learning how to speak grammatically is easier when you learn to write it in a structured way.

Just a tip to help you along you way.

P.S - Katakana...is brutal. I hate it. Hiragana is so comfortable and easy and then we get...sticks. No way around it, though - katakana is just as common as hiragana, if not more so.