If you meet a foreigner for the first time and want to express that your English level is not very high, I hope the other person will forgive you for your possible rude behavior, you can say this:

Nice to meet you. I must say that my spoken English is poor, so please forgive my oral mistakes.

Nice to meet you. I have to say that my spoken English is not very good, so please forgive my slip of the tongue.

If the other person is very important, you should first understand the social and cultural background of their country, including their life, taboos and so on, and just pay attention during the conversation. ?

Please be friendly when asking foreign friends to sign. Nice to meet you. Can I take a picture with you?