Since you went with a pre-made blend, your dosage flexibility is limited. That's not necessarily bad, just something to keep in mind. What are you hoping to get out of it? General health improvements, muscle growth, better sleep, improved skin? Your dosage should align with your goals.
I personally inject twice a day because of my eating schedule. Once before bed, once when I wake up. I'm aiming for more general health benefits, but the extra help in my workouts is nice too. I avoid food for about an hour before and after injecting, focusing on limiting carbs. Others have different ideas about this, though.
If you are wanting more muscle growth, reach out to @BigTex, he can provide useful insights.
I usually dose around 250-300 mcgs when using the blend.