Carrer guidance

Hello seniors .My background is neuroscience and my thesis was on neurostimulaion . I have developed a huge interest in comp neuro and would like to puruse a phd in it . But since i dont have any experience in it . I would like to apply to research internship roles for comp neuro . What are the best resources to learn comp neuro and how to showcase the skill i learn . and what are the best way to apply for research internship roles im based in the UK