I really liked mine. Simplicity with no slides to breakdown. Just take it easy driving it especially if it has been sitting for a while. I lost mine to a fire that was thought to have been from a dragging brake caliper which I had paid a mechanic to service but likey he did not. Take it slow and easy watching for signs of overheating and such. Before you start out work the brakes a few times going foward a few feet stopping and backing up a few times to loosed up any rust and such in the brake system that might cause binding and overheating. Those were not sports cars and trying to blast down the expressway at 65/70 mph especially if it has not been regularly serviced could be asking for trouble so keep it below 60 and don't push it on the hills.
I am going on the thought that the coach has not had a recent lube job and regular maintenance so at least check the fluids, engine oil, coolant, brakes, transmission, power steering and stop to have the univeral joints/carrier bearings on the drive shaft greased and rear axle fluid level checked if that has not been done already. If you have someone handy available who owns a grease gun they might be able to assist you with much of this.
A stop at Walmart to pick up some Ford transmission fluid, extra engine oil, coolant and brake fluid would not be a bad idea either so you won't have to go on a quest for it when you really need it.
Tires really need to be checked and inflated per the sticker on the drivers door before you drive it and checked regularly on any long drives. You may want to consider staying off the highways until you have warmed the tires up and have them worked in again to prevent them from over heating and thumping at higher speeds. If they are over 5 years old be very carefull about driving the interstates or coming down South as tires you may get away with up North tend to blow out over here after the get that old even of visually they look new.
Does it have the Jet Air suspension? That was probably the best option available on those old Vectra's. If it does put it in automatic mode for driving (not park and level) and give the system time to level off the coach before driving off.
Do consider getting a spare ABC fire extinguisher of decent size just in case. The one that came with the coach even if the gauge reads good could be compacted and clog when you need it and it is too small for anything but a minor kitchen fire at best.
Here is a link to your operators manual if you don't have the binder that came with the coach:
If you are not new at this I appologize for treating you as a beginner but safety is always #1 and even more critcal when dealing with old, large vehicles such as your Vectra.