China is the 9 day shipping component. I use JLCPCB most and SeedStudio because depending on the features each has their own pricing benefit. If you are comfortable with a paste syringe and the component count is small you can skip the stencil and order multiple projects at the same time to seriously save on shipping. Youtube has great videos on stencil pasting and reflow soldering with a heat gun. If you aren't familiar with EDA software you can start at Fritzing or EasyEda and move on to Kicad. Altium is the standard at big businesses.
Here is an example of an MCU based tilt sensor I made earlier this year. I have about 12 hours total into it including inception/design/layout/soldering. It would have taken me 12 hours to breadboard it with components I couldn't use in production. I do this a lot so my process is rather streamlined. I made about 25 boards this year, mostly small test circuits. https://imgur.com/a/XJxp0tO
Here is an example of an MCU based tilt sensor I made earlier this year. I have about 12 hours total into it including inception/design/layout/soldering. It would have taken me 12 hours to breadboard it with components I couldn't use in production. I do this a lot so my process is rather streamlined. I made about 25 boards this year, mostly small test circuits. https://imgur.com/a/XJxp0tO