[Formal] You can talk in Spanish. = Usted puede hablar en español.
[Informal] You can talk in Spanish. = Tú puedes hablar en español.
[1st Person] I can talk in Spanish. = Yo puedo hablar en español.
As you can see, each verb has a different ending. Because of that feature, many times, Spanish speakers leave off the pronoun (Usted, Tu, Yo, etc) and don't say it at all, particularly when asking questions.
To say 'I have to talk' in Spanish, you would say 'Tengo que hablar.'
To say 'I am going to talk' you would say 'Voy a hablar.'
Yo no habla Espanol.
No hables.
Yo hablo.
No me hables.
Habla demasiado.
ustedes hablan
I think you may be thinking of the term "Spanglish".
Hablar mucho = to talk a lot Hable(me) mucho = talk (to me) a lot
Nice to talk with you - Encantando de hablar usted.
No me hables en español