Q: number of sites and hosting

Here are few questions:
1) How many different sites can i create in teir 1, 2, 3??
2) Whats the Database size limit for teir 1, 2, 3??
3) Do you host websites??
4) Do you provide site XMLs and Robots.txt for each website??
5) Can I deploy custom code??
6) Can I use Zapier to collect the leads?? from the forms