These are the tools I recommend all the time, all of which I actually use for my own business!
If you want more info on these services feel free to contact me.
Webhosting A2 Hosting
I use the Turbo shared hosting plan.
Mailing List Mailchimp
I use the Forever Free plan.
Scheduling Acuity Scheduling
I use the Emerging Entrepreneur plan.
Note that Squarespace bought Acuity in 2019. Squarespace Scheduling and Acuity Scheduling are the same product.
Email Google Workspace
I use domain-based email and Google Drive.