Transactional emails not working (Magento) -- 3

Im setting up a services website, about running errands, daily tasks, so, think that users/posters are buyers, taskers are sellers and the task is the product. I ve made some costumization to some email templates, i ve started with the new account email, and this one is working fine, the problem starts here: - Buyers emails- I ve costumized the sales emails, i ve selected them in system configuration, made them active, at this point i can only see the new order email ... after this they dont work... for example i post a task... taskers place a bid on task... i should receive a mail saying the tasker applyed for the job. -Sellers emails- this is about the emails that taskers receive, like when someone assigns them a task, i cant see where to select the costumized emails like i did with the sales emails. And also they dont work. I think the default email were working well at the beggining of project... problems started when i started costumizing the templates... Can anyone help me? Best regards