Propagation: Heat Mats, Perma Nest trays, Humidity Grids, 1 by Gardeningdiva

Gardeningdiva wrote:
We built this in order to start seeds this year. But now that I have been reading more about it, I wonder whether I would have been better off just buying plants. I didn't think about trays that didn't leak. Seems that all the plastic seedling trays all have drain holes. So...

1) Do I need to order Perma Nest trays?

2) Then, someone told me that I needed humidity grids and heat mats.

3) Someone else mentioned that our lights weren't good because they were fixed and not able to go up and down.

4) Do I need domes over the trays?

5) Is there a certain kind of seed starting tray that most people use?

6) Where does everyone order the materials? The prices online vary so much. My local stores don't have much.

What do you all recommend?
Thanks for any help!
Dee