[Jemmo (Adrian)]

I finally got a clear night to use my 10" dob I just got 2nd hand. I only have cheap eyepieces at the moment. By cheap I mean came in the box with a $150 scope but it's all I got for now.
I used a 12.5mm ep last night and got a good shot of Jupiter and 4 moons I could make out the bands around Jupiter.
I'm just wondering what eyepiece I would need to see Jupiter filling up the eyepiece I read in the next few days 4 of its moons will be infront of Jupiter I won't see them with my current lense I doubt.
What ep would allow me to get really close? A 9mm with Barlow? Sorry if noob question I am a noob lol