Poser is "tricky" and "finicky" no not easy but practice helps learn how sensitive the booger is. DAZ|Studio is a free program that is really almost identical to POSER (All my props I buy from DAZ, the models are interchangible between both programs.)
It can get EXPENSIVE. So if you download DAZ|Studio let me know. I presume you're wanting SCI-FI corridors?
If that's the case don't buy any, I have a TON of Sci-Fi models and I'll set up a place you can download them.
Also don't BUY anything... retail things are EXPENSIVE... I have a platinium club membership with Daz... most things I can get my hands on for $1.99 Let me buy the crap for you (If I don't already have it.) it will save you tons of money.
As I don't ever "build" from scratch I have no clue. I use available models and tweak dials. Actually building them you'd have to check DAZ's forums I can't help you there I can barely code a website. You'll probably have way more luck in figureing out how to build models and perimeters much MUCH better than I.
^_^