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World Config Options
The first the you should do is set the preview biome size to the size you expect to use, you get huge differences in preview otherwise.
In order to make the world's height vary more, one can simply move the Factor slider under Height Variation (Page 3). The further right the slider is, the more the variation. Increasing Factor has smaller effects on biomes that normally have small height variation.
Offset has a similar, more powerful effect, it adds constant height variation to all biomes. Negative values can be used to keep some low height variation biomes at low height variation after increasing Factor.
The Special slider under Height Variation has a very unique effect: high value increases height variation in parts of the terrain that are below biome's natural height, low value makes the height variation lower in these places. This can be used to make terrain with flat mountains and adventurous valleys (low noise factors/height variation factor, high Special factor), or with flat valleys and extreme mountains - very low Special value. Default value of 0.25 tends towards the latter.
Note: Somehow the effect may be perceived as increased height difference between biomes.
This can be done by using the Factor slider under Height (Page 3). Note that the effect is usually very strong and setting an unreasonable value will make the terrain dominated by cliffs between biomes, and will probably turn rivers into canyons.
Use the Offset slider under Height (Page 3) to control the world height. This value is usually interpreted as ocean height, so it's usually a good idea to set Sea level (Page 1) to the same value (or 1 block less)
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Factor - This option sets the variable heights of the biomes. Setting a larger number here can create cliffs between biomes and at rivers.
Offset - This will set the height for your world. This can be set independent of sea level to have all biome heights offset to higher Y coordinates.
Factor - This breaks up the terrain and creates mountains and islands above the biome height.
Special - This option erodes the land and creates voids below the biome height.
Offset - Adds islands above and voids below biome height at up to equal offset values.
Period X,Y,Z - This will mostly determine how large your landmasses area and how smoothly they are built. Low numbers will yield lots of smaller islands while large numbers create huge islands.
Octaves - When placing or deleting land, this determines how big your 'paintbrush' is. A small number indicates large edits while smaller numbers can make finer adjustments. You will notice many circular shapes on smaller island with the smallest setting.
Factor - Magnifies the effects of the Period on X,Y,Z and can extend the effects on Y like height variation.
Each biome has a natural height range and this determines how it behaves in those ranges. Effects only visible when High/Low/Selector noise settings are off/low.
Adds pockets throughout the land. The offset here determines whether it eats those pockets away or eats around the pockets.
Creates smaller adjustments in the land, blurring the edges. It can even break it up into continuous small islands. The offset option here will set to add to subtract from the land.
This will be used to set the size of your islands and voids. The offset option here will raise or lower the overall land, including offset height and height variation. This magnifies the height difference between biomes.
-To create large islands and caves above sea level, you can set a large value for X-Period in the high noise area, and then set a medium value to Y-Period. Keep the low noise and selector noise values to a minimum. -To add the water caves below sea level, just increase special factor in height variation. -To create Larger biomes, you can click on the preset button on page 1 and find biome size and manually enter larger values.