Well, get the railing from local retail to avoid dent or bend, curtain wise, measure ur window/sliding door, go shopee/taobao (taobao cheaper but need to wait), give them ur measurement and wait for it to arrive.

Just done mine recently, total approx. 8m width of windows, got total of 15m width curtains (get approx. 1.8x - 2.0x width of your windows), roughly RM200 for the curtains.


Blackout %% depends on ur preference, but I would advise to go for 80%-90% will do as our body cycle will need some lights to 'wake up' in the morning.
For 100%, once in a while will be good, i.e. staying in hotel for a few nights only