There are hundreds probably thousands of ESL websites out there, so one of the first things to do as a new English language teacher is get online and see what is out there. A lot of what you will need will depend on your school, some have their own books and might already have a curriculum arranged. In that case you probably only need the odd supplementary materials. Other schools will not have anything set and it will be up to you to devise a schedule and lesson plans, don't panic because there are loads of people and sites ready to help you out.
These are some of the most useful websites that I have used and continue to use:
Waygook - a forum which is a great source of information and is also rich in materials. You can download many ESL materials from full lesson plans to games and other bits and pieces. No matter what book you are teaching you will probably be able to connect with someone who is also teaching it or has usedit before. Make sure you join this community I could not recommend it more.
ESL Printables - This site has some of the most well made and comprehensive downloadable printables on it. However you do have to join and you have to submit your own work in order to be able to download. It is well worth it and a great way to give back to the community. I can always find things on here when I need a extra worksheet or something - you can search by grammar point or topic which is great if you are looking for something for a specific for a lesson.
Barry Fun English - this is a resource website for games, worksheets and some other teaching stuff. Mainly aimed at elementary level students. You do have to pay a subscription fee to use most of the services but it is well worth it as it has some great stuff.
There are loads more but these are the first ones that I check out when I am looking for something. Hope these help you out and remember if you have any questions just let me know in the comments and I will be happy to try and help.