Sure, these are some outstanding places you've chosen to visit in Australia. Here are some travel tips to help you:

Best Time to Visit:
The best time to visit Adelaide is from March to May and from September to November, during the city’s fall and spring. For Flinders Ranges, Innamincka, and Birdsville, the cooler months from April to October are more favorable.

Route and Accessibility:
Adelaide is well connected by air with major international cities. From Adelaide, the Flinders Ranges are reachable by car in about 5 hours. From the ranges, you can take the Strzelecki Track to Innamincka (about 6-7 hours) and then onward to Birdsville (about 8-9 hours).

Altitude and Acclimatization:
The altitude in these places isn’t significant enough to cause altitude sickness. However, do take breaks while driving long distances.

Accommodation and Booking:
Adelaide has a range of accommodation from luxury to budget-friendly. Both Flinders Ranges and Innamincka have several camping options, while Birdsville has a famous pub that provides lodging. It's advisable to book your accommodation in advance.

Clothing and Essentials:
Pack clothes keeping in mind the variations in temperature especially in desert areas. Include sun protection, a wide-brimmed hat, sunglasses, sturdy walking shoes, a good map or GPS, and plenty of water.

Health and Safety:
Keep a first aid kit handy. Be careful about the local wildlife, and make sure you have enough fuel for your vehicle during long drives. Avoid driving at night to minimize the risk of wildlife collisions.

Local Etiquette and Respect:
Respect the local Aboriginal culture and adhere to any instructions. When visiting sacred sites or culturally sensitive areas, follow instructions, and guidelines provided.