I don't know of a getting started guide (Hmm, maybe i should write one for the wiki) but I can certaintly point you in the right direction.
If you read the wiki, you probably noticed that Thermal Expansion has some IC2-like features, including doubling ores. The pulveriser is a good place to start. It runs on Buildcraft power. For the very first engine, I would recommend a steam engine. Other then that, set up shelter and farms.
Once you have plenty of resources and a base, start researching all the crazy stuff you can do in Tekkit, such as energy, space, and automated mining and farming!