I agee with what others have said above. Knights are a social status or a title given out for deeds or by bithright.
Now if you are asking what type of skills a knight would have it would depend on the setting or time peroid. The way I would go about it is to create a series training package for each "training" season or year that a PC could buy. [TP's give a 25% discount on skills and there is a program in the vault that can help automate the process.]
Also in historic examples some knight's started traning at 11-13 as squires or wards of other nobles. So they might start with basic weapon traning, horsmanship, careing and feeding of the aminals, caring and up keep of armor and weapons, tactics, how to govern a land, lore: religon, etc. Looking at historical examples you can look at knights in Europe [England, France, Spain, Germany], knights in Aribia, Mongol warriors, Sammari's, etc. There are a lot of other examples out there from fantasy, such as knights who ride dragons, gaint birds, griffins, marine animals, elvish knights, dwarvish knights, etc. You can also specialise the knightly orders like they did in the middle ages or schools in Japan and China. Some specialsie in tending wounded, protecting travellers, building castles, taiming the land, bring religon to reigons, etc.
Also if that is the campaign you want to run maybe the GM will start you at higher level then 1st or give you extra DP's to spend for adolesence and apprentiship periods. For a begining knight I might start them at 5th level or higher if they are part of an order or a full fledged member. If they start at a lower level I would have them be a knight in training [kit's] and have them work there way up to being a full fledged member.
If you are looking for more info please post what your campaign world is like or even some of the TP's you create so others can comment on them. Also a knight in general as I said above knows a lot of other skills besides the basics of weapons, armor, horsemanship etc.
MDC