1) email marketing works best if your subscribers trust you, so you need to strike the right balance between sending commercial vs non-commercial emails so that your subscribers can both stay active and engaged, but also buy from you.
2) you need to
keep acquiring subscribers continuously, as eventually, most of your subscribers will become inactive over time no matter how much you nurture them, and - in order to maintain or grow your profits - you need to get new subscribers (on daily basis actually)
3) there are
2 types of offers that are irresistible to most subscribers, regardless of niche:
freebies, and
discounts. So, as long as you can offer something of value for free (but which
can't be gotten anywhere else) , or a decent discount (at least 10%, but I usually offer 25-30% discount), you will see high rates of subscribers.
Freebies can mean anything: PDFs, videos, accessories (in case that you're doing ecommerce), printable worksheets, software, etc...
4) the headline is the most important part of your emailing campaign. Assuming that your subscribers know and trust you (and that they're kept active and engaged), you want the headlines of your emails to be the absolutely best and most perfect thing ever, because the goal of headlines is to get your subscribers to open up the email, and if the headline is not compelling / interesting / catchy / controversial / irresistible enough for them to click on it and open up to read your email everything else won't matter anymore as you've lost! The game's over right then and there! It's done, finished! You've just lost a potential sale and / or lowered the engagement of your subscribers with that skipped email.
So, put most of your attention and focus into crafting highly clickable headlines (just don't do clickbait because that's the fastest way to ruin your reputation and hurt your campaign)
5) the rate at which you're going to send emails varies based on industry, product, type of campaign, etc... Meaning,
you can send emails as often as daily (I have seen some entities sending multiple emails per day even, but I advocate against doing this because it will annoy people and they'll unsubscribe)
and as rarely as monthly, (don't send every few months though, as your subscribers might forget about you)
When you're just starting out,
I recommend sending out 1 email per week, this is the sweet spot that I've found works for most email marketing campaigns, so stick to this and increase / decrease the duration as necessary as part of your campaign tweaking strategy. But tweaking should be done down the road, not initially. Initially go with 1 per week for some months (let's say 3-6 months), and then - after you will have acquired enough data - you can increase or decrease the frequency of sending as you see fit
6) a good ratio of commercial vs non-commercial emails (assuming that you're choosing the 1 email per week routine), is
1 commercial email for every 3 non-commercial ones that you're sending out.
You can do it like this: send non-commercial emails in the first 3 weeks of the month, and the 4th one can be promotional. This is a tactic that can work well in the beginning (when your subscribers are fresh and / or don't trust you enough).
7) there are
2 approaches to email marketing:
cold emailing (not recommended if you're a newbie), and
opt-in marketing (highly recommended if you're just starting out with email marketing).
Since cold emailing should be left to the pros only and since you seem newbie, I won't discuss this type of email marketing.
But with regards to opt-in marketing, there are
4 things you need...
a) a page (or website) that you can place your opt-in / subscribe form onto
b) a way to generate traffic that converts into subscribers
c) a freebie, or product / service that you can offer discounts for
d) a software / service that handles all email marketing operations automatically, 24/7 for you
Back in the day when I did email marketing, some of the most popular email marketing services were
aWeber,
GetResponse,
ConstantContact,
VerticalResponse,
Birdsend, and a few others that I don't remember.
Probably that most of these services are still live today, and if they are (and if the pricing structure fits your budget) you can choose any of them as they're pretty good... or at least they used to be, I've not tried them in over 10 years, so I'm not sure what they're like now.
But if you don't like them I'm sure you can find alternatives with a bit of research. At their core, all of these services do the same things basically, so you can't go wrong with any of them (you do need to look into their email delivery and open rates, though, as these are paramount to the success of email marketing campaigns)
- they create highly converting, professional opt-in forms that you can place on your site
- they handle and automate the entire opt-in process (collect the name and email address of your subscribers, send out the confirmation emails, add the legal and unsubscribe stuff at the end of your emails, etc)