The easiest way to advertise on Facebook and IG is via Live video. Follow the 3 Es: Educate, entertain, or enlighten. Teach your audience, make them laugh or wow them, or enlighten them with a story about you. If you do the Live video on Faebook and you stay under 10 minutes, you can download and upload it immediately to IGTV, instagram TV. You an then cut up the video with a free app (Inshot, iMovie, etc) to upload 20-second teaser clips into FB and IG stories with a call to action to watch the whole video. You can use a shortlink from LinkHero or Bit.ly to make the link to your full video easy to remember. Once you do the Live video, you can boost the post or run targeted ads. Hope this helps!