¤ as soon as you don't have any reward to receive for your current club, I think is better to move before the end of the season.
¤ the upgrade is canceled and still all your facilities is downgraded, 1 level each.
¤ depends on your plan, you can spot a team that has potential super stars and big stadium, this can easily generate money for facilities upgrade in a long run. this is what you will aim for, because no need to get a team with high FA/YA, low stadium 50k, this will decrease the income for your club and it will take a long way to get it higher.
But for me I will consider high popularity regardless of facilities, as this will help me gather money quicky, upgrade stadium quicky, and get going quicky.
¤ again depends on your plan, and what you want, could be to take your most talented young stars or your current best players.
take young talents if the team has high FA facilities or best players to sell for cool cash for your early beginning. Or to solidify your starting 11.