Congrats on the new transition! For digital newsletters, I really like MailChimp as a great tool to store contact information from donors and have them on a nice email list to send to when you need. It also offers plugins to allow you to collect emails on your website if you want to spread your reach.
In terms of pricing, they have a free option available for up to 2000 subscribers and up to 12,000 emails sent per month. If you surpass that # of subscribers, you can opt into other plans at about $10/month. They also have a bunch of beautiful templates that are drag & drop so it makes it really easy for you to create emails. You can check out their pricing here.
Hope that helps some. Best of luck!
#FundraisingandDevelopment