A common problem 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.
This example applies this exercise 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 using a triplet rhythm. The first one uses only downstrokes. Three
This next right hand pattern is very common when playing triplets. The principle is to start each beat with a downstroke.
These are only a few examples of picking exercises. Try making up some of your own. With all technical exercises, and everything you practice I strongly advise using a metronome (or a drum machine). This is the best way to develop a good time feel and avoid the habit of speeding through the easy parts and slowing down when things get difficult.