Ask HN: My consulting business is overtaking my day job, lost on how to manage

I'm currently working a day job as a software developer. At my current job I'm unsatisfied with the environment and I'm no longer learning new things. I have put in my notice and leave at the end of the month.<p>On the side I have 2 startups, and 4 projects I'm managing. That means meeting with clients, doing all the UI/UX for 6 projects, handling payments and invoicing, and managing 6 people full time.<p>My questions:<p>a) What software do you use to manage your projects b) What software do you use to invoice c) How do you manage people? d) What resources do you have that would be a good read in relation to project management<p>Thanks!