3 x 25' won't be a problem with a twin vac.
Re furniture, etc, you've got to decide how you position your business. Full service = do everything you imagine your customer will want - move all the furniture, always go that extra mile, etc, etc - and price accordingly. Cheap = decide what price you need to charge then work out what you can do within that price. It's up to you.
We've always gone the "full service" route, and we'll move everything - full cabinets, pianos, plants, and then coaster it all up, and we try & charge a lot!