Back when I was charging good money to answer questions like these (circa 1980) I was happy to answer them.
But you will appreciate things more if you actually go look up the answers yourself. Go out and buy things like the AIM, TERPS, or read the info in jeppesen manuals.
Read about such things like how designated mountainous terrain makes for different altitudes.
I'm sure you are a great person. But go do your own homework. You will thank me later.
There are some great books on instrument flying out there too. READ or go out and find a really good CFII and pay him.
Anyone answering these questions, while well meaning, is actually making it harder for new instructors or old ones to make a living.