Should I get a partial Fursuit, or wait?

You're smart to recognize the concern about outgrowing a fursuit. Yes, your best option would be to get a partial fursuit and wait on getting the full fursuit. You may outgrow the handpaws and footpaws (you didn't list your age so I don't know how much more you'll grow) but those should be cheap enough to replace, especially when you get the full body suit at a later time. The fursuit head will be the most expensive part so you'll want to make sure that's built in a way that can either be expanded as your head grows, such as with removable foam padding inside that acts as a spacer, or is large overall so you'll grow into it. The same fursuit builder or a different builder can make you the full body part in a few years when you've stopped growing. Or at that time you may decide you want to retire your first fursuit head and get the entire thing remade. The tail isn't something you'd outgrow, and you can save the tail for when you partially suit and have a duplicate of the tail installed on the body of the full suit; alternatively, keep the same tail and have a hole in the back of the body suit that you can put the tail through so you use the same tail whether partially or fully suiting.

You can definitely wear shoes rather than furry footpaws and many fursuiters do that for any number of reasons. It won't look as authentic as having furry feet looks but it certainly wouldn't be anything out of the ordinary. You could make some special socks with fur on the cuffs/ankles so it looks like a furry leg and foot is what's slid into the shoes, while what's in the shoes is just regular sock material. You could also modify a pair of regular shoes to have a fur covering and a shape of a footpaw while still being a regular shoe inside with the regular tread on the bottom. There really are no limits to what you buy, make, or modify for a fursuit.

Have a look at furry convention photos, or convention videos on Youtube, to see all the variety of how other fursuiters wear their full and partial fursuits.

Partial Fursuit