How to/Where to find MySQL templates for Toad Data Modeler
You should use MySQL Workbench for work with MySQL. It is an excellent, free and Open Source tool for working with MySQL databases. As well as that, there isn't a one-to-one correspondence between Oracle and MySQL datatypes. Some samples/examples are available here. 

[EDIT] Ooops - just realised that there is Toad for MySQL, so presumably the data types will be appropriate.However, I would just suggest that the best people to make admin tools for a given database are the actual manufacturers of that database - Toad started as a specialised Oracle product and probably still carries some baggage from those origins, whereas MySQL Workbench has always been a specialised MySQL tool.

Having said that, compiling it from source is a tricky business with numerous components and unless you're a guru, I'd use the pre-compiled version. If you are interested, you might like to look at this site which is a kind of MySQL Workbench fanzine. This site is also of interest to those working with MySQL.