if i just went ahead with the deca---what would be the benefits and drawbacks....
Are you asking what if you went with the deca alone, or added in with test?
If deca alone is what you're thinking, expect loss of libido, an increase in lethargic behavior, and a lot of bloat. Size and strength will go up, but with the added negatives I laid out, the whole process will be a bitch.
If it's added with test, this is a better choice, but being your very first cycle it's not the best choice. Since you've already started your cycle this does change things, but I would still never recommend this for a first cycle.
1. Research
2. Ask questions
3. Research
4. Plan cycle
5. Ask for feedback on cycle
6. Research advice
7. Make necessary changes
8. Do cycle
This is the proper order in planning.