We see a lot of emails here. We've written quite a few too. If you are just getting started, here are some basic tips to get started.
Make a single ask. It is almost never a good idea to ask for more than one thing at a time in a
New Organizing Institute has a basic but decent checklist of effective email writing. It covers basic process and techniques. What I liked about it was that its simple and to-the-point and doesn't attempt to make email more complicated than it really is.