That's a Reba RL, is it not?
Here's the detailed chart (which should also be on a sticker that is located on the rear side of the left lower fork leg) :
<140 lbs : 70-90 psi
140-160 lbs : 90-105 psi
160-180 lbs : 105-120 psi
180-200 lbs : 120-135 psi
200-220 lbs : 135+ psi
The fork has a positive and a negative air chamber. Both need to be checked/adjusted.
The valve for the positive chamber is underneath the cap with the "+" mark, on the left side, on top of the fork crown.
The valve for the negative chamber is on the bottom of the left leg.
Basically the number of psi in both positive and negative chambers would be 2/3 of your body weight in lbs.
The Reba's maximum recommended pressure is 200psi, just in case you're near the 300lbs mark.
Softness may be the result of too low pressure, but also of different pressures in the positive and negative chambers. It is generally advised to start out with the same pressure on both ends.
You can always use different pressures to make it a bit more responsive or harsher, but the difference between + and - will never be big.
As for determining the ideal pressure for your weight and style, I'd suggest starting out with a higher pressure than recommended for your weight.
Use the red rubber band on the right inner leg to see how much the fork compresses during a ride. Just slide it down to the lower leg and go for a ride. Then work from there until you're happy with the stiffness.
Ideally the rubber band should be at least 1/2" from the crown at the end of any ride. If it's closer than that, you need more air to avoid bottoming out the fork.
It takes time to set it up, but this is a great fork. You'll need a good pump for adjusting it, and I'd recommend the original RS one. It allows you to let air out as well as putting it in.
http://www.ebay.co.uk/itm/Rock-Shox-Hig ... 544wt_1396
No idea on the rear shock though. Still, a Google search will help you find a PDF of the manual.