Self-Employed Tax Return Review and Planning Advice

I've been running my own consultancy for three years and I'm getting confused about my tax obligations and allowable expenses. I had a decent year last year but I'm worried I might be overpaying tax or missing deductions. I also need clarity on National Insurance contributions and whether I should be incorporating. A friend recommended getting proper advice before my next return is due. What I'm looking for: A straightforward review of my current tax position, advice on legitimate expense claims, and guidance on whether incorporation would benefit me financially. I'd also appreciate general planning tips for the year ahead.