The general principle here is similar to that of tracking time in Books and elsewhere.
Create Projects (and choose to relate it to a client or not), create Jobs for those projects, add users to the jobs, etc.
Definitely just make sure you have a good feel for how to set up everything you need in People.
It has some peculiarities, one of which is the annoying filters for viewing time logs and timesheets, but once you get a feel for it, it goes really smoothly.
It’s optional to push those timesheets to Zoho Books as well to invoice your clients. Consider integrating People with CRM as well to be able to pull in your Contacts/Accounts and relate projects to those CRM records.