Depending on what you have already, here's what I would do:
0. Exp+ gear
1. Spop (for the ribbon)
2. AWM-RD, Deagle-Scope, AK-Knife
3. Perm Axe from coupons
4. You'll probably have like 500-600k GP: buy Speed C4 / Nades+ / Breath Down / Bags3&4 for like 300 days!
5a. Spend rest on Aug-Camo, Deagle-Camo and Thompson.
or
5b. Buy some GP weapons: Steyr, AK, QBZ, G36K (it's epic, some ppl underestimate this gun), ...