Good stuff – learning a musical instrument is a great thing to do!
Most electronic keyboards these days are touch sensitive – it’s only on cheap ‘toy’ ones that you might not get it. Assuming you are getting full-size keys, the difference is in the weighting of the keys. Electric pianos will have a heavier action than keyboards, to mimic the kind of action on an acoustic piano. Keyboards are great for messing around, but if you want to progress on piano it’s worth getting something with a proper action to build strength in the fingers.
Unless you go for a decent piano, you might not a full 88-keys too, but the smaller ones can be more portable for taking to school concerts and such like.
Go to your local music shop and have a look what you can get for your money. 🙂