Help in the search for Trademark US Licensed Attorney

Hi there. My name is Alberto and I am from Spain. I have formed an LLC together with my sister and we want to register a trademark to be able to sell on Amazon. Being a foreigner, I need a US Licensed Attorney to perform the process in the USPTO. I create this post to ask you if you can recommend one that you already know or have used. I would also like to ask what is the average / normal price that usually costs this process, since we have low resources and do not want to overpay the service for lack of experience.

Thank you very much to all of you.