Ask HN: I am going to build a Web App. I need specifics.

I am going to build a very simple web app that allows people to post a picture and a description. I am going to be working with an overseas programmer. Why am I doing this? Because I can and I want to learn this process. I have wireframed the entire website (as I see it so far). I have some specific questions.

1. When someone creates an account how do I keep track of all of that information? Obviously it goes in to a database but is there a program that allows me to access that information. Should I hook it up with something like mailchimp?

2. Should I use github and Heroku?

3. I want to add in sharing (Facebook, Twitter, email). Is this hard? Should I build this in later?

Also I would be willing to pay an experienced programmer/engineer to help walk me through this process.

And spare the lectures about how this is a bad idea cause I know they are a coming ha. I am doing this to learn the process and if anything comes of it then that is a bonus.