A TA (teaching assistant) can be a massive help to a teacher in a classroom. As a teacher you may have a teaching assistant with you all the time or you may only have one for a limited number of days or hours per day. If the teaching assistant is higher level, they may be able to teach the class and cover if you are absent but this has not shown to have positive effects on pupils learning. A Ta should be used to aid the teacher not replace them and using a TA to work with low ability children also has not proven to be beneficial.
Ideally you will want to have time with your TA out of teaching time to discuss and plan future work. You need to ensure that your TA understands exactly what you need and expect of them and where the boundaries are.
You may want to use your TA to deliver one to one support or in a small group as long as this is overseen by yourself. Make sure that the TA has strict guidelines to follow and that you discuss with them the progress of the students on a regular basis.
The TA can be useful when it comes to having a second opinion. They may be able to share their views how they would carry out a certain lesson which could prove beneficial.