Operating an agency is not easy. Whether you are a 1-person agency or a 10-person agency, having the right systems in place is key. There is nothing worse than having a dysfunctional and unorganized business, hindering your ability to scale.
The Agency Playbook by Jason Swenk
is the best operational resource for agencies. It's one of those courses I wish I had back in 2010 when I first started Mod Girl as it would have saved me a ton of time and hassle. So if you're at that stage where you really need to get the proper systems in place in order to scale, you should check out the Agency Playbook.
(P.S. I'm an affiliate of Jason's and I get a commission if you invest in his Agency Playbook. I'm only recommending it because I personally invested in it and found it very valuable, especially for startup agencies!)