Something you should know up front is that Deca is not to be messed with on a first cycle. It can give you some incredible bulking gains, but it's so suppressive that the recovery is just brutal. I would recommend that you start out with the test and dbol that you have. 30mg each day (ED) is more than enough to make some nice muscle gains. With what you have, that will last you just under 5 weeks (about 33 days).
And from what it sounds like you have some Test that is 300mg/ml? 300ml of test is a shitload, I'll gladly take some off your hands, lol. If you have a single vial it's likely 300mg/ml and 10ml total. 300mg is a little less than desired per week for a first cycle, so getting another vial of the same would be helpful so you can run 600mg or so EW for about 10 weeks.
Click on the link that Pillarofbalance posted a few posts back. That will lead you to my full first cycle run through. It's the basics of what you need to know and what you need to have to avoid any problems. Read through that entirely and then get back to me with your thoughts.