No problem. I started off the exact same way. I ended up purchasing a Dell OptiPlex I5-6500, BV-Tech unmanaged POE Switch and use Blue Iris. I have since purchased 4 of the IPC-HDW5231R-Z turrets and one IPC-HDBW4231F-AS | Dahua Technology - Dahua Technology for a front door camera. Here is a thread where another member used this camera at their front door - Front door ID camera IPC-HDBW4231F?. I also purchased two of these - ANNKE I61DR 2MP (Hikvision Cube Clone). Use one in the garage and another inside. I also have some cheap Foscams I bought years ago before I stumbled onto this forum.
It takes a lot of reading and learning but almost every question you can think of has been answered somewhere on the forum. So if you are wondering about something be sure to try the search function.
Depending on your budget and needs you can always start with the basics to get you up an running then build onto your system. Always leave some room for expansion because once you start putting cameras up you will find a need or want to put up more cameras.