ProFTPD user question...

I have questions:
1. If I create a user account name: user1 & passs=123456, Now, in the proftpd.conf file I put like this:
................
UserAlias user1 user1ftp #set alias user for user1
........................................

If I ftp into this server and use user1ftp & pass=123456, will it point to user1's home directory?

2. I want to setup /home/ftpstuff/ for 2 user(ie. admin & reguser). I want useradmin have full read/write to the directory /home/ftpstuff/download & /home/ftpstuff/upload and I also want user reguser have READ ONLY to /home/ftpstuff/download and have full rea/write to /home/ftpstuff/upload

My question are:
a. How can I create 2 accounts to access to same directory(in this example is /home/ftpstuff/)?
b. How to setup to do like what I said above?

Thank you