Cold Email as a Small Business Owner

Hi! So I was just wondering, I own a small marketing agency and am doing cold email to reach out to potential new clients.

I wanted to know if it was a good idea to invest in a cold emailing tool, what would you recommend and what's the best practice to use them and not get into spam?

Also, should i create more email accounts for it? if so, how many? I've been doing a few manual emails a day from my persona business account.