Injectable steroids are injected into muscle tissue, not into the veins. They are slowly released from the muscles into the rest of the body, and may be detectable for months after last use. Injectable steroids can be oil-based or water-based. Injectable anabolic steroids which are oil-based have longer half-life than water-based steroids. Both steroid types have much longer half-lives than oral anabolic steroids. And this is proving to be a drawback for injectables as they have high probability of being detected in drug screening since their clearance times tend to be longer than orals. Athletes resolve this problem by using injectable testosterone early in the cycle then switch to orals when approaching the end of the cycle and drug testing is imminent.
So to summarize, I highly recommend utilizing orals in this cycle. It will help get your body at a positive nitrogen balance immediately. The anadrol will pull water into your muscle cells along with nutrients to speed up the muscle building process. The dianabol will cause a massive increase in glycogen storage which will keep carbs readily available for your body to use, resulting in LESS muscle breakdown. This is why I also advised you tso have HIGH CARBS to supply your glycogen. Hell if you can get over 500g carbs you will only gain from it. The more carbs you eat the less of your protein gets used for energy. This is why you don't NEED 40% of your total calories to come from protein, if you have high enough fat and carbs your body will fully use the protein it has to build muscle.