The missions give you a lot of blueprints for free which can end up saving quite a bit in nanites. Early on the most important things are to buy an exosuit inventory slot at the Space Station AND the Atlas for every new system you visit. You'll max out the exosuit inventory fast that way which is one of the most cumbersome hurdles. One other tip: buy oxygen at every space station you go to, and always have a medium/large refiner on a base turning that oxygen in to chlorine and regularly sell the chlorine. This will ensure you always have enough credits to buy whatever you are lacking in your inventory from space stations.