Marhaba! In my experience, I always start by learning the alphabet, memorizing the letters and their pronounciation. This I practice daily, adding 4 letters weekly and practicing throughly. At the same time, I learn about 4-10 words weekly, and recite them everyday. For example, I speak Spanish and I'm learning Arabic. As already mentioned, I choose words which I use daily. Slowly, I substitute each of those words in my daily life, when speaking with other people, even if I am speaking in Spanish, in my head I say the words I am learning in Arabic. With this, I create a natural relation between the two languages, my native and the one I'm learning. And so, with time it would be natural for me to think in both languages.

So- 1.alphabet 2.vocabulary 3.substitute ***4.Practice every day (very important)

All of this could take about 10 minutes daily. And the oral practice is simply a substitution in your head. Also, to have a partner with whom you can practice is even better.