Is the American Red Cross Lifeguard Training all I need to have in order to become a lifeguard everywhere?????

Depending on where you want to work will depend on what certification you should get. Most pools require the red cross certification. You also need to know whether your pool requires the regular lifeguard course or the water park lifeguard course or if you are planning on working at a waterfront then you will need the waterfront course. Usually you just need the red cross course which includes CPR/AED certification, but check with the location where you want to work to be sure.