Alright pal
Personally I usually let Frimmy and Park go. Frimmy for around ?1.5m and Park on loan with as much wages paid for as possible as he's on 50k p/w.
I usually play 4-2-3-1 and often with 2 CDM's. Arteta as the DLP and Flamini as your ball winner.
Try and retrain Ramsey/Wilshere to play CDM aswell if you're going to use this system - I just find it's alot more stable defensively.
Also upgrade all your youth facilities/training facilities. Get the best youngsters coming through.
If I sign anyone (I usually play without the first window budgets) I sign Leandro Damiao. Around ?5m he's a great option to rotate with Giroud.
Hope this helps pal and if you need anything else I'll try my best and offer you some advice.