I would not be breeding to stallions you have found on a general horse classifieds website without having extensive information on the bloodlines and progeny at the very least.
Also keep in mind - because the stallion is deceased you will be very unlikely to get a LFG, so if the straw does not take, you will be very out of pocket after all the vet bills on top of the service fee. The semen is also now quite old, and even though frozen, the viability of the sperm will be dropping significantly the longer it remains frozen, making it difficult to get anything but an absolutely exceptional broodmare in foal. If you mare is a maiden, I wouldn't bother.
Also, what are you looking for in a foal? Do you want a classic, cart horse type friesian for show, or are would you like more of a sport horse type that you can compete on successfully under saddle. Friesians differ enormously in type, and the cart horse types do not do very well under saddle as they are not built for the work, where as the sport horse types will not do so well at the bigger breed shows.