I started as Bradford a few seasons ago and at the time I signed a striker called Stern John who did amazing for me, think hes 34 and free transfer at the start.
If you get offered Oliver Norwood on a free from Man U later on in the Season definitely try and sign him as hes one of my key players and im top of league 1 atm.
Apart from that, Lois Karius is a good goalkeeper if you can sign him!
Another useful players is Ignasi Miquel, I got him on loan from Arsenal and he was a great central defender for me.
Hope this helps, good luck!