In terms of rememberingredients them mnemonics can help a lot with kana (hiragana and katakana) if you can find ones that work for you. Unfortunately I can't give any advice for helping to remember kanji since I have started it yet myself.

I think most start with hiragana then katakana then finally kanji. Kanji is the hardest to learn as there is over 2000... Kanji also has multiple readings. Hiragana example あいえうお　AIEUO Katakan example アイエウオ　AIEUO Kanji is normally mixed with more kanji or hiragan to make words example 花Flower、　火Fire、　花火Firework 行　This Kanji normally has something to do with movement. When hiragana く is added to it it becomes iku 行く which is the verb to go. The hiragana added to kanji is normally there for conjugation reason like changing 行く into its polite form would be this instead 行きます read ikimasu. Hope this help ^^