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I agree with the comment above: a shorter focal length does not always deliver better results - often quite the opposite. When starting out, we all have a tendency to think bigger magnification is best - it often is not the case. You would get better results only on the best nights, but for a beginner, perhaps this is not the best investment to start with. You could always grab yourself a decent X2 barlow - that will always be an accessory you can use down the road and will convert your 10mm and 25mm into 5mm and 12.5mm although the 10mm on top of the barlow might not deliver outstanding results.
But I have found personally a decent mid range eyepiece (say 12mm or so) to be a nice improvement over stock eyepieces and make the overall experience more enjoyable, especially if they come with a bit extra field of view (more than the 50 degrees on the stock plossl). It is a bit of a personal preference in the end, but IMO unlikely to be a purchase you will regret. try not go go too low in focal lengths however, this is a specialised eyepiece that you night not end up using as much as you'd like.
In the end, the best way to improve your experience is to get familiar with the sky and try to get as much out of your existing equipment as possible. If you decide to purchase additional accessories, my opinion is to buy decent quality items, as you will be able to carry them along with you, should you ever decide to upgrade your telescope down the road.
For photos: I know some adaptors exist where you can mount your smartphone on your telescope: it uses a bracket and an eyepiece that let the image focus on your smartphone camera. You won't be making the greatest shots, but it's good for fun. Especially suited for the moon. Don't know about the planets but it would be quite hard I imagine. Forget the deep sky targets with this setup.
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