Sorry to hear about your amputation, but glad you are not letting it slow you down. As far as tips and tricks go, read the very first thread in the pumpers forum, namely Vacuum Pumping 101. Scan several other threads as many contain good advice on things like lubes, milking the tube, performing kegels while pumping, etc.
A couple of quick tips. In order to become accustomed to the pump without causing damage, take it nice and slow at first. Keep your pressure around 4 in hg and your pump time to about 10 minutes. You can do 2 or 3 pump sets per session and finish with a nice hard on massage for 10-15 minutes.
For lube, I prefer KY Jelly or the Target or K-Mart equivalent brand that sells for about half the price. The KY makes a great seal and cleans up with just warm water. Apply it to the first one inch inside the cylinder and on the cylinder flange. Also apply it all over your cock and at the base.
Have a bowl of warm water handy to make it slick for when you exit the tube say after your first set and are ready to enter it again for you second pump set.
In between pump sets, massage your cock to restore blood flow and maintain an erection. Use the warm water to keep things slick. No need to reapply more KY after the initial application, as the water will do the trick.
Let us know how it works out or if you have more questions.