Self-Employment Tax Return and Allowance Advice

I've been freelancing as a consultant for three years and my tax situation is getting complicated. I'm not entirely sure what expenses I can claim or whether I'm using the right allowances. I've also had some income from a side project abroad which I'm unsure how to declare. I need someone to review my records, advise on legitimate deductions, and help me understand my obligations before my next self-assessment deadline. What I'm looking for: A straightforward review of my tax position, clarification on claimable expenses, and guidance on declaring foreign income. I'd like practical advice I can follow going forward.