A common problem that guitarists encounter with right hand technique is picking "in between" two strings. Playing a downstroke on a lower string followed by an upstroke on a higher string is easy enough but when you reverse the picking direction it becomes more difficult. Here is an example using open strings.
Here is an exercise using this technique. Practice it slowly at first.
Example 8 applies this technique to the whole minor pentatonic scale. Be sure to use alternate picking throughout.
Here is another picking exercise using the entire scale. Once again start with a downstroke and use alternate picking.
Here are two examples to help develop your strumming technique. Both of these use only the first three strings. It is very common in Funk to use chords consisting of only three or four strings.
These are only a few examples of right hand exercises. Try making up some of your own. With all technical exercises (and everything you practice) it is advisable to use a metronome or a drum machine. This is the best way to develop a good feel and avoid the habit of speeding up in the easy parts and slowing down when things become difficult.