None of those are proper English. "You could help me?" would be used in response to someone offering help if you aren't sure they offered help the first time. However, you would use "Could you help me?" if you want to ask someone for help. "Can you help me?" is also correct.

Could you help me? Or, can you help me?

Nada de eso amigo. Se dice: Could you help me? y es como ¿Podría(s) ayudarme? o Can you help me? es como ¿Puede(s) ayudarme? También puedes decir: ¿En qué le puedo ayudar? - How can I help you? Espero que mi comentario te sirva de mucha utilidad. Cualquier cosa, puedes comunicarte conmigo.

"Can you help me?" or "Could you help me?" are both correct. Never use the preposition "to" after a modal such as "can", "could", "may", "might", "will", "would", "should", etc. The only exceptions are "ought to" and "have to".

A simple tip: "can" and "could" are never followed by "to".