Just opened an LLC in November, and I know absolutely nothing regarding taxes

I opened a permanent makeup studio in CT in November. I know absolutely nothing about filing taxes for a business, but can not afford a tax professional at this time. I know I'm supposed to file taxes quarterly, but other than that, I know nothing about what I'm supposed to do. Do I need to report this income on my personal taxes as well? 
2023 will be a wash for this business, since I didn't make any money in the two months I was open, but I know nothing about claiming a wash. 

I also have a pet sitting side gig, it's not a registered business, but I've been getting more clients, do I need to register this as a business and pay quarterly? Or can I report this income on my personal taxes? 

Like I said, I know absolutely nothing, and all of this is so overwhelming, so any feedback or suggestions for a first time business owner would be greatly appreciated.