It's not hard people

1. Put the bike in front of a non distracting solid background such as a wall or garage door, make sure the front wheel is pointing straight...

2. Chain in the big ring, small cog, align crank arm with chainstay or seat tube

3. Align valve stems / tire logos if you want

4. Step back, zoom in, fill the frame with the bike at a crouching level

5. Take the picture, make sure it's not blurry or underexposed. Keep trying until one of them is presentable.