is it possible for me to send a text message to someones phone from my email? If it is how do I do it?
It depends: Here is an article that I found that list many of the carriers that provide the necessary ‘gateway’ to allow this to work (The article was updated Jan 2019)
Email to SMS needs to be done at the carrier level (most will have an email like firstname.lastname@example.org. Some will add .text or .mms in that address . to send to non Republic numbers you need their email address
Republic does support simple SMS from email (once turned on in the Republic app).