I've used the same furniture in every house in which I have lived, and since much was inherited, it had already been used in many different houses.

Use what you already have first. Live with it and then slowly start changing out pieces.

You will get a better feel for what you want to do when you have lived with it for a while.

Just decorate with your own furniture, especially if it's eclectic.

Sometimes it is a concern, like heavy Renaissance Revival furniture not working in a small modernist house, but that's a problem of scale as much as anything else.

Absolutely decorate the interior with the furniture you love. Don't give up those treasured antiques or other furniture pieces because the house style is different. Also don't feel obligated to fill the larger house right away. Take your time like you did with your previous house and find what items make you happy.

I think your style mix will absolutely work with one caveat.....SCALE. Some antique and trad pieces can look too undersized. Miniaturized but not in a good way. Usually this can be remedied with thoughtful placement,maybe some re-jiggering ( e.g.,new mats and frames to give art more presence), and sometimes re-purposing to smaller spaces,e.g.living room chairs become bedroom chairs. As others mentioned,we've moved a few times. My forever loves always find a home. I think yours should,too.

To me there are two main concerns: budget and your own style. It's your house and you have to live with it not anyone else. If you will be happier having your home look more polished then save up until you can get the flooring/furniture etc. that makes you feel good when you walk into your room, but until then it's all a work in progress.

I would take exception to the concept that changing the furniture would make the house look more polished. It might make it look more like a builder's model home- there are people who would prefer that look and others who would sneer at it. Two different ideas of what a house should look like.