"Hi, I have a cool idea and need someone to do the coding part. I can offer you 20% | 30% | ∞ stake in the future business."If I said yes to every proposal I get, I would have never finished this website for example. Time of developers is very expensive and time of experienced professionals like me is unaffordably expensive to waste it.
"I still think my idea is great and would like you to hear about it." Ok, imagine if we are in elevator and you have just 30 seconds before we leave it to explain your idea and get me interested. If you think you can manage that - send me an email and I will read it next time I am in elevator (tomorrow).
"Hi, I am stuck with an issue and thought I'd contact you because you look experienced enough to know the answer. What do you think may be wrong with my code?" https://stackoverflow.com
"Dear Ilya, we have seen your works and would be interested to hire you. Could you please send us your CV and some references?" I believe this website has all necessary information in place. If you don't find it sufficient, then your company is not the right place for me.
"I really like things you do and would like to become like you, where should I start?" I have no clue but you can start with this website.