1: Get a dictionary and start speaking with natives. 2: Read a lot of Japanese things, and look up any Kanji you don't know. 3: Watch Japanese shows. 4: Listen to a lot of Japanese music and look up the lyrics. 5: Study at your own pace. Never rush learning a language. Hope these help.

Since you know both HIragana and Katakana already (great job), I would start doing simple sentences. Think of small sentences or phrases that you normally say each day and write them down. Once you have a small list, go and find the translation for each item. Many sentences that you use follow a pattern and you'll likely notice a similar pattern in Japanese as well. Once you have the pattern, you can use it to swap out words to make new sentences. For example: I am a [boy]. 私は男の子です。 You are [tall]. あなたは背が高いです。 He is [over there]. 彼はあそこです。 That is [amazing]. それは素晴らしいです。 All of these sentences use the same pattern in Japanese: [A] は [B] です. Play around with that a bit and make up your own sentences. Post a few articles trying out new sentences and get feedback. And, as I'm sure your aware, add new words to your vocabulary each day so you can say even more stuff. But most importantly, have fun. Find ways to enjoy the process. You don't want this to feel like work. :)