Obtaining you first credits can be very discouraging. This is intended as a guide for those trying to get their first credits. The only real way you are going to obtain credits is by getting the highest score in Game, Super Game or Hardcore. Sometimes this can be easy, as nobody has played it in the last 24 hours or the needed skill level is very low. If you just want one or two credits, I recommend the ZiS or DShK, because many would be competiters are turned off because of the sheer number of parts. If you notice that the hardcore mode has not been played in 24 hours, but you can't get past the Super Game, you can unlock all modes with 1000 exp, then achieve a shit result and get a credit, and exp for top 3 and champion. If you want more than a few, you really can't count on this. I recommend causally disassembeling a weapon (preferably not a super popular weapon, AKS-74U and AK-74N are better than AK-47 for getting credits) until you know how it goes. You should eventually get very good results (such as 12 min→7 minutes for DShK game, completing DShK super game). If you do not learn from your mistakes, it will be very hard (example: missing the little spring inside stock under trigger group in SKS). Other factors can make it harder, mostly your crappy luck (such as me pushing up the needed skill level for 1st place Walker Revolver disassembaly). Some days are better than others.
Some recommendations:
After removing a part, if needed, disassemble it before taking apart the rest of the gun. This way, you don't have to waste valuable time trying to find those last few parts. This doesn't apply to hardcore mode
Do not rush the disassembaly at the cost of loosing the Sniper and Serenity. If you have sniper achievement, your score will be doubled. The way to get 1st place is by having the highest score, not the highest speed.
After a while, you should find that getting credits is not impossible. The pricer the gun (the more "forgotten"), the easier it is to obtain a credit in general, as you have fewer competiters. You are likely to be interested in expensive guns that are interesting for you. Buying from the catalog is often cheaper than trying to "buy" your way to the weapon (but more expensive in the long run). You can mark a weapon with a star even if you don't have it, then if there is just a silhouette it will be marked by a star, allowing identification of the location
Although this wiki is very dead and outdated, I think that some beginning players will come here and see this, before realizing that this place is 98% useless and inactive and then leaving to never return. Hopefully this will make it more useful