hey guys, before i begin please do not roast me and forgive me of my ignorance towards the topic, lol

general info:
Height: 5'10
Weight: 205
Age: 21
cycle experience: this is my second cycle!

ok here is my cycle: 11 weeks test enan (400-500mcgs) dbol ED 30mg, and deca for 5 weeks (200mcgs)

my first question is that can i run deca for 5 weeks only, just to see how my body reacts to the compound, or should i run it for 10 weeks? I dont want to see that my body reacts badly and have to waste alot of money for nothing

my second question is that nolvadex is not available for me, however, can i use tamoxifen instead, and will the tamoxifen have the same effects?

thank you all for help!