Some would argue that tren is not a good idea for a first and even a second cycle... that being said, a good starting dose would be 37.5 - 50mg ED... daily injects are often preferred because of more stable blood levels... others will say that EOD injects work just fine...
Also, aside from a rare few, most wouldn't run tren with deca since they compete for the same receptors (both are nandrolones)... AND you'd be shutting yourself down pretty hard....tren has a fair amount of sides... and both tren and deca are infamous for ruining libido.... test & tren is a good starter... maybe even add EQ in there