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For starters if the car has sat for many years don't start it.
I would flush the brake system with new fluid and drain the fuel tank fill with fresh gas, change the oil and pray. Pull the fuel pump fusses and crank engine until pressure starts to rise before starting after flushing teh fluids.
The brake booster could be many things. If the pump does not start when the key is turned it could be the ignition switch. Once the pump is engaged it should pressurize the bomb in about a minute or less more than a minute and a half it probably needs a new pressure switch.
I would also verify how old the tires are. Porsche recommends replacing after 6 years if they are older I wouldn't drive it. These cars can hurt you with bad tires.
Sorry I can't be of more help but I wouldn't expect to start and drive it after sitting for so long.
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Anthony PCA affiliate '77 member '83 '90 3.8 RS tribute, 91 C4 converted to C2,'93 964 C2, '93 928 GTS M '94 Turbo 3.6, '15 Boxster GTS M,16 GT4,23 Macan GTS,
Gone worth mentioning '71 E '79 SC, '79 built to '74 3.0 RS tribute (2390 # 270 hp), '80 928 euro 5 speed, '74 2.0l 914, '89 944 S2,'04 Cayenne TT '14 boxster, '14 Cayenne GTS 14 Cayman S, 18 Macan GTS many others
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