New player here

Like the title says, im pretty new to factorio. And i loved it so far. But im a bit stuck rn, and i wanted to ask if you guys have any tips to progress. Im unlocking the blue and black science packs (sorry i dont remember the names) and i dont have enought resorces to mass produce them. Should i start with trains or agument the miners i already have. I really dont know. Thanks in advance for the time.