Go after education first...some mentioned it. Experience with established tree services. Study arboriculture at your local college and library. Read lots and lots of these threads. Tap into ISA and learn the skills of climbing and the art of pruning. If possible, attain ISA certification so you can understand what you're doing and can offer many services instead of just removals. Slowly and gradually acquire the tools you need to match the services you can offer and stop this nonsense about cranes and buckets!
Then start your business, when you can offer a positive impact on the industry.