I ran my own limited Co. for several years and it is almost impossible to answer without having more specifics.
Things to consider:
1. Will the work/contracts you do be inside or outside of IR35
2. You will almost certainly need to be VAT registered
3. Running a limited company means managing the accounts; filing tax returns, including quarterly VAT returns; paying VAT and corporation tax; maintaining records for at least N (7?) years; and most likely employing an accountant
It may be worth looking at working through an umbrella company which is slightly less profitable than your own Ltd company but does remove A LOT of the hassle.