Welcome aboard! Are you looking for a big battle game with big armies or more of a skirmish level thing with a couple of small forces to a side?

I'm actually interested in both.

QuoteI'm actually interested in both.

For bigger battle stuff it might be worth looking at Warlord Pike and Shotte. They're generally pretty good all purpose rules that do cover the period you're looking at. I don't play Warlord rules much myself anymore but they are a solid starter set and generally give a decent game, only issue is because they are all purpose they can be a bit bland for specific conflicts. I'm not aware of any specifically for Flodden though, it's an interesting one as it sits right on the cusp of Medieval and Renaissance. Possibly some War of the Roses era rules might suit?




For 10mm basing it generally breaks into two camps - multiple bases per unit or a single base per unit.

For multiple bases for the period 40x20 or 40x40 are pretty common , whereas single bases 60x40, 80x40 or 100x50 all work pretty well. It depends what you want, i.e. do you want to be able to represent different formation and statuses using multiple bases or have something easy to move as a single base and allowing a bit more freedom with how you arrange the troops.

Formation changes tend to be less prevalent pre-18th Century or so, meaning you can generally get away with one or two bases for a unit and just use a marker to indicate as needed, but tastes vary. Most rules seem to be fairly agnostic of basing, so long as both sides are similar.

Bloody Barons from Peter Pig gets a good rep from friends and is set in The Wars of the Roses. I've never played it but the set up and playsheets are available on the website so you can get an idea of what is likely to be involved.

https://www.peterpig.co.uk/

Welcome to the forum.  You could also look at "To the strongest" if you are happy with grid based systems. With that you can make a unit whatever size you like, as long as it fits in the grid.

In general 40 x 20 size bases seem to be fairly generic with most rule systems now.