Trade Mark Registration and Infringement Advice Needed

I've developed a distinctive brand name and logo for my new product line launching next year. I need to register these as trade marks across the UK to protect them properly. I'm also concerned about a competitor using something quite similar in my sector, and I want to understand if I have grounds to challenge them. I'm looking for practical, straightforward advice on the registration process, costs involved, and whether I should pursue the infringement matter. I'd prefer someone who can explain things clearly without unnecessary jargon.