Here at North Star, we've been very impressed with the Lion Rampant rules by Osprey Publishing.
We have written a short article in our online magazine about putting a retinue together. It'll only take a few moments to read, and it's free – have a look.
All the figures in my Retinue are Crusader Miniatures, and they have some new Medieval packs designed for Lion Rampant coming out later this month.