Stargazing101

hey guys i have had my celestron explorascope 114 az for around 5 months and i have seen saturn and jupiter through my 3x barlow and 20mm eyepiece and it was a bit small to see. i recently bought a 2x barlow, a 6mm plossl eyepiece and a 15 mm kellner eyepiece along with some filters. i was wondering what would be the best for viewing saturn and jupiter (mainly saturn) if there are eyepieces that you can recommend can you please send a link to a shop were i can buy them from. Thanks