That's a great way to start!
More and more schools are wanting NVQ level 2 TA or childcare qualification as a minimum. You could study for that now if you want to. (One evening a week/fortnight for a year and a minimum of 5 hours a week volunteering in school).
It's the best job I've ever had And the worst paid
Each day is different. You never stop. You work with different groups of children. You run intervention groups. You do one-to-one with low achievers. Update records, do assessments, loads of photocopying and laminating, doing displays. The list is endless. Teaching assistants need assistants. There is always pencil sharpening and filing to do! At the end of the day you really feel like you have made a difference.
The part of my job I'm not keen on is clearing up glue and paints! It's so time consuming and there is no time between finishing that activity and going on to the next! Also the constant whining of parents who 'know' their child should be on the next reading level as if it's a race or something.
The best part is being part of the 'clicking' process when you see the lightbulb go on in a child's head in reading or maths. I get quite emotional
A good Head is essential. You feel part of the team and valued. My Head is always interested in the professional development of the support staff.
Good luck!