LogFAQs > #973882672

(edited down because I was being way too freaking verbose, but feel free to ask for clarification)

Pick a team of four to stick to, and save your resources for them. There will come a point later where branching out will make sense. For now, fight the overworld bosses for character ascensions, the weapon domains for weapon ascensions, and when the time comes, talent domains as well. Don't bother with artifacts until later; just use what you pick up. But this should be the focal point of your resin, plus weekly bosses.

Important question: Are you playing the characters you like, or do you want suggestions on what would make for the most powerful team? Miko+Beidou is a good start since they both (especially Beidou) want energy and a second member of the same element helps that out. They both work from off-field, so you have freedom to play them with pretty much anyone. A hydro or especially dendro character would make for good reaction damage.

If it were me, and feel free to ignore this, I'd use Xingqiu and Kirara with them. Alternatively, Barbara and Dendro Traveler. This is only considering who you have right now and not future pick-ups. You might not know this yet, but Traveler can use any element. You just have to travel to the corresponding nation to attune to that element. (It's like the Trailblazer, except you have to go back to switch.)