It's a little hard to understand your question, but yes, you can make the plots on a HDD, it's slower than SSDs, but possible
Here I make plots on my SSD and takes 6 hours, with my HDD 7200rpm takes 14 hours
You can mine solo, and I recommend at least 100Tb to have good chances to find blocks, or you can try Hpool to mine in a pool
If you wait some weeks, official pools will release, and this pools will use portable plots, a different plot than we have now.
Meaning that miners will have to replot from scratch again? Chia sucks in some areas lol, anyways it's better to wait till official pool gets here, that's what I'm doing presently, and since you have to start plotting all over again there is no point going for solo mining right now