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Agree with Steve about the 3.5mm - don't bother. While it may be the theoretical maximum magnification, you'll only be able to use it 1 night a year due to the seeing and atmospheric conditions.
Stick to around 150-200x magnification as a maximum, which would be a 5mm eyepiece for you. You'll get the best views probably with a 10-15mm eyepiece on most DSO's, and maybe a 7mm EP on the planets and moon.
Are the 10mm and 25mm GSO plossls? They're ok for the price.. If you get a reasonable 2x barlow you'll double your usable eyepiece collection and that should keep you going for a while until you've had a chance to gain more experience.
I'd recommend getting along to an observing meet or star party near you and take the chance to look through some other eyepieces.
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