Assuming you have Tren Ace dosed at 100mg/ml, 0.5ml would be 50mg.
Now, you need to take Tren Ace every other day or every day as it is a very short ester, so 0.5ml every day would be 350mg per week which is a very strong dose and might be too much for some, and taking it every other day would be 175mg per week, which is more reasonable.
Ideally you would be taking the Tren every day at 0.25ml which would still be 175mg/per week, and you see how you react to it.
If you have Test Cyp, you can take it as you do normally.
Be aware of the mental side effects of Tren, it can cause mood swings and paranoia, make you snappy and mess with your sleep.