I soak the seeds in a container for about 8 hours. less, they don't germinate well, more they tend to get moldy further on in the process.
I rinse twice a day for a couple of days until there is a root bud on most of the seeds, then transfer them to the trays I have. These are reused trays from items gotten at the grocery store (think clamshell plastic), I drill about 6-8 holes in the top so some ventilation. In these I rinse twice a day until ready. Then I clean all the containers with white vinegar after scrubbing them with soapy water (dish soap)
Note that we keep our house pretty cool - if the environment is too warm, you are more likely to get mold. Our house is set at 62 during the days we are home, and 58 at night and days I work away from home. Mold was why I went to growing the fodder - but I just can't grow enough to be worth it space wise - given how long they take to grow and how big my flock is. I had to move the 'operation' to the kitchen because 'my room' is most definitely even colder (?about 5 degrees, maybe more), and they just were taking forever to sprout and would eventually get mold. In the kitchen window, it seems to be working well (knock on wood here), but really, it is not, imo, enough.
I almost sent you a set of the things I use - but then you had mentioned you were going to be away, so I didn't. The 'soaking jar' I use is a large seasonings container. It works perfect - half fill with seeds, top up with WARM water and let soak overnight (again about 8, maybe sometimes 9 hours) drain through the seasoning shaker holes, rinse, and drain again...rinse and drain all the others in progress. I find it takes about 8-10 days for them to be ready to feed.