Well first of all your going to need more than 1 vial as Deca generally starts to kick in around week 4-5. So if you have only one bottle and you take 1ml every 5 days its only going to last you 7 weeks. 300mg of deca a week for a 1st time deca cycle is fine, if I were you though I would take 1ml every 7 days so the bottle will last you 10 weeks. If your set on every 5 days then your going to need to get another vial to make it last long enough to see good results from deca. You might want to run a low base of test every week along side the deca, or even QV Winny if you can get your hands on it at at least 50mg a day. I'm guessing you dont have any PCT or anti-e's ready in case of gyno?
If you really live in mexico getting all this should be no problem, well except the bromo/dostinex. Go buy some clomid at the farmacia so when your cycle is over you can at least run it for PCT to help recover your natural testosterone production. You may want to consider running b6 throughout your cycle 100-200mg a day.
Oh and as far as workout tips, might want to post your current routine, diet, weight, height, age, etc.