Look, ignore the height thing, formation wise, If I was you I would play either 4-4-2 or 3-1-4-2 that suits the players you have, use them for now and be thinking on the lines of getting rid of any really older players at some point!, try to keep you special ability players when you can, you should be looking to upgrade a few players each season, try to keep there condition to a maximum as best you can, when it come to training try and do it after you last match of the day and try to do at least two of them in one day, one thing to be aware of is when your next day match is, if it is only say 8-12 hours later then only do the lightest training!, this is what I do.