Welcome onboard....
Theres not much anyone can reccomend from your brief intro, may I suggest using the Search feature on Rebreather World to find other threads where similar questions where asked.
Either that or explain abit about your diving and someone will then make a reccomendation.
Simply reading the forums will answer alot of questions... although it'll probably cause you to ask hundreds more!
BEN
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Know your PPO2, Pre-breath, Use checklists, Validate cells at 6mtrs, Use pure O2 at or near surface, Use a BOV, Don't dive Solo, Change Slime and Cells as recommended by Manufacturer and RTFM!
Beware Fridge Suck!
www.hugsac.org.uk