You say noob, if an actual noob and its first cycle you need to run test only this round brother. If not jack it up fool! Keep proper ratio of test/deca. Deca being half the mg's of test and certainly not more than 60% or so compared to test. some can only handle the 50 and others higher in terms of deca dong so the 50 is safe. If you do have cycle experience and proper age etc your best bet is to front load with prop and then you can begin both at the same time and get the cycle rolling rather than wait. Future reference, when asking questions drop in your age,stats and cycle experience brother.

Definitely draw with a 19 or 20g, then switch to a 23 or 25g for injection... I learned this the hard way bro..... when running deca, I like to load my test for 2 weeks before adding the deca, and yes, I load in the same syringe....

Just normal safe injection protocol bro... Keep shit clean and new pins everytime