Here's an easy guide to start freestyling. Please note, nothing in freestyle is set in stone; That said, all these are high recommendations to maximise control from the very beginning.
Lowers
-Juggle with both feet, 1 juggle per foot in a row
-Use shoes
-Be able to juggle at least 70-100 on first attempt
-Learn atw with both feet* and both directions(clockwise and anticlockwise)
-Learn hatw,htw and crossover with both feet*
Sits
-Juggle to with each feet
-50-70 on juggles on first attempt
-Learn crossovers, x-overs with both feet
Uppers
-Headstall
-Sideheadstall both sides
-Neckstall
-Shoulderstall with both shoulders
* Optional, but recommended
Here are some general tips:
-Set achievable goals for yourself. Eg, I can already do atw-atw, I'll go for atw-atw-htw.
-Train sits in the corner of a room. This will allow you to stop needing to get up and fetch the ball every time you stuff up.
-Train using reps to enhance your consistency. Eg, Try to land the same combo/move 5 times before moving on.
-Positive thinking is always good, it takes a lot of time to get be able to achieve even the simplest of combos.
-Keep yourself hydrated to maximise your training sessions. A small sip of water regularly keeps me hydrated.
-Stretching before and after will help you have less injuries and benefit your training sessions.
-If you are experiencing soreness, read this:
http://en.wikipedia.org/wiki/Delayed_onset_muscle_sorenessEDIT:Just adding more information. I'll be doing this every time I remember something. If anyone else has extra information, please comment below.
Typos fixed.