Hi Holly
There's many factors to consider and Crunch has got some help centre articles that can help with this!
Key points are income and liability.
If you don't think you'll be making over 20K in the first year or so, then it's probably not worth going Limited as there are additional taxes to be paid if you do.
However, one of the bonuses of being Limited is that the company will cover any liability, meaning you're better protected as an individual.
Check out some further info here
(https://www.crunch.co.uk/knowledge/becoming-self-employed/what-is-a-sole-trader/)
(https://www.crunch.co.uk/knowledge/limited-company/setting-up-a-limited-company/#difficult)