I'm far from an Expert but like the song says... I know a Little and Baby I can Guess the Rest...

Two of the most important things are a Tripod & Remote Switch...

Canon Remote Switch RS-80N3 2476A001 B&H Photo Video

Now lets get Small...

With Macro look for the picture inside the picture...

By that I mean... focus on the leaf and not the bud...

At this range your depth of field is less the 1/2" so compose the shot taking that into account...

Other Tips...

Good lighting in the 6500K to 7500K range...

If the plant is movable, place on a table so you have full access...

If the plant is no movable you can cut a bud or bud section off to work with...

Take lots of photos of the subject, normally 1 out of 20 shots is a keeper...

In this photo the leaf is 1/4" x 1/2" my focus point was the leaf tip allowing the rest to fade out naturally. Then I cropped the photo so the focus point is to the right and not in the middle of the photo...