How do I get editing help for technical (mathematic/statistic) paper publishing?
I suggest these four steps:


Identify your research community. The problems you are working on should have some connections with previous works. If not, it will be hard to publish your work anywhere, because it is harder to draw the attention of other researchers on your topic. You can use search engines such as Google Scholar for this purpose.
It is likely that the authors of these papers use the same notations, publish in the same journals and use a similar article structure to describe their work. Become familiar with the format by reading related articles.
Write down a draft, following the usual format of your field. If your English is weak, you can ask someone to fix your mistakes (he/she should not need to be familiar with your work, but it is easier if he/she has some scientific background).
Contact a researcher working on close topics, asking him/her for feedback on your draft. If the feedback is positive, a collaboration might be possible.


I have followed these steps and this has lead me to my first research paper (co-authored with my "mentor"). It takes a lot of time but it is worth the effort.