Thanks you for your reply.
Where is this calculator? A link would help.
Sorry... I should have provided a link for you. A good site is
http://www.bitcoinwisdom.com/difficulty. On the top right of the page you can put in different values and see the results. For example, if you put in "1" in the "TH/s" box, you'll see the numbers adjust and find that expected earnings in BTC for 1TH/s are 0.0106
BTC per day.
And also, how to find and compare various pools' stability? A step by step guide, baby step by baby step would help.
Unfortunately, I can't think of any step-by-step guide out there for you to peruse, other than the pool threads here on the forum. I can give you personal experience, though. I've mined on Slush, BTCGuild, GHash.io, kano, p2pool, Eligius, etc. If you're looking for responsive pool operators, here's my list:
Eleuthria (BTCGuild)
DrHaribo (BitMinter)
kano (kano.is)
-ck (solo.ckpool)
wizkid057 (Eligius)
These folks are ALWAYS on the forums and either directly answering user questions or providing updates on pool happenings.
Other pools and operators have different methods of interaction. For example, Slush uses IRC, email and a support website. P2Pool has great community support and a ton of knowledgable and helpful users to answer your questions (you'll find me in that thread quite a bit, along with windpath, PatMan, jedimstr and a bunch more).
No, really, I have not decided if I want to mine altcoin or bitcoin. I care about stuff like stability and profits. Where to start? Going to the altcoin forum would imply I have already chosen a route - this is not the case.
I suggested you go to the alt coin forums because they are more knowledgable about their pools, switching algorithms, payouts, etc than you're likely to find here in the BTC side. It was to help you research and educate yourself so that you might make a well-informed choice on where to mine, not a predisposition of choice.