hi, i started as a player for a month or two on the tekkit server then became a tekkit judge long before the reset i am no longer staff there but i can tell you how i got successful before the reset even happened.
first of all make your way out of the spawn run around and explore and make some allies and friends. Do not trust everybody for they do not all want to help you some may even kill you. Take a while to learn who is really who and who to trust. Try and find a experianced player who might seem to develop and interest in you and can live with you as your partner, my partners were Immiel, Roby and Haoss07.
Now when you have some friends and starting equipment try and work your way to find materials such as rubber, oil , invar and more metals and ores that can help you. Iron tools are right for the cause till you can afford a diamond tool or simply a power fist with the upgrades.
your first goal should be to produce a power suit with a power fist and to gain the materials you need to create modules for it. Protect your home while your at it with towny or the golden shovel thing. Once you have the invar, tin, gold, copper, electrum that you need to produce your armor build the armor modifying table, then build the modules you wish to install. Power suits operate on modules or systems that you plug into them, like space helmet, power tool and more.
Your second goal is to produce power, i recommend you use steam, combustion , stirling or magmatic engines. Setup a straight line of redstone conduits about 10 blocks high and place the engine of your choice by right clicking it on the conduit so the engine is facing the conduit. wrench the conduit till they turn orange, *note wrench only works if an engine is attached so place it then wrench the conduit its attached to. After that is done and you have 40 engines placed 10 on each side fuel them with what they require and place a redstone energy cell anywhere on the pillar as long as it is attached to the pillar directly on a blue conduit not an orange one. Take a conduit and plug it in to the back of the redstone energy cell and wrench it so it turns orange, now make a trail from there to all your machines. Now you have electricity !!
Your third goal is to produce machines do your work for you, which is first order of buesness produce a quarry get the materials you need and make the quarry. When ready supply power to the quarry by leading conduits from the back of the energy cell like we did in step 2 all the way to any side of the quarry. The quarry will automatically begin to cut blocks and make sure you have placed a chest on its top or on any free side of it. congratulations you now have a auto miner mining for you, be sure to check the chest for valuables. It will excavate a single chunk and it can be rigged for more but lets not go there yet.
your fourth goal is to make machines like pulverizers and more machines, later a forcefield to protect your lands and keep expanding.
I hope your tekkit journey goes well.
if you have any issues contact me Andrew2060 via pm or post here for any help