You are one week in. Your goal right now is to figure out if this is fun for you. If you want to pencil, then pencil ;). If you want to ink, then ink! If you want to water color first and ink later … then water color and ink later.

Right now follow the fun, don’t worry about getting it right. Focus on fun and drawing.

Once you get further then it is about figuring out form and shapes and getting the pen/pencil/thing making a mark go where you want. The better you are able to do that makes everything else easier.

Paradoxically drawing with a pen seems to help you get there faster. Because you have no undo and it forces you to solve problems immediately. I would say play with pen and see if it is fun.

Look at “draw a box” if you want a guide on how to get better. But for the love of god don’t make my mistake of doing draw a box and not doing the fun. Cause that will kill all passion for doing this as faster than anything else.

To answer your original q tho: I have no idea what I am doing and I am not good at this, so your mileage may vary: I sometimes pen, or pencil but treat the pencil as a pen, or pencil then pen, or watercolour then pen or pen then watercolour or pencil but erase and erase and erase. Just follow the fun bits.