Welcome to Fuwa, Fujimoto . Let me ask you about something, are you from Germany?
There is no 'perfect way' to learn a language, mate. Learning a foreign language will never be easy. Especially language like Japanese (you need to get used to new characters which are different from latin alphabet). You just have to "live" the language and the rest will come itself. Learn kanji, master hiragana/katakana, think Japanese, watch anime/read manga, try to find some Japanese friends online, talk with them, play japanese games... There are a lot more ways to learn the language, you just need to discover them. Don't give up.