statistic to display

hi
i want to display with php code this statistic in my home page:

1. nomber of listing in the site.
2. nomber of auctions in the site.
3. nomber of regular sales in the site.
4. nomber of listing that already been sold.
5. money count of the listing that been sold.
5. nomber of users in the site.
6. number of users online.

thank you