I have the exact same one. I would germinate on my own first. Also first time grower I had a couple ways
How did your grow end up?
a good bubbler with strong aeration will buble up enough moisture to keep the underside wet and ther roots will find it. Common hydro knowledge. Happy growing
For you all new to hydro. I did this exact thing in 2005. What you need to know; When I experimented with a 6 top 10g bubbler; I could only use it for veg, without having a massive tangle of roots.
If the grower had trained this growit might have been interesting, and tangling of roots could be acceptable, if you don;t mind it, and train the top…Say; Low stress training. ot toppping , toppping, topping to manage the canopy.