need help buying league 1/2 players

hi guys

just started a save with rotherham! so far so good im top of the league and in the 3rd round of the fa cup! just want to know who is worth buying for league 1 (counting my chickens here) i currently have harris (millwall) a goalkeeper called nicki bull and also loaned vermilji and tom thorpe from man utd!!

i play a 4-1-2-2-1 formation just wanted some advice as im not all clued up with the lower leagues!!

thanks for any help