Hi Yasirs,
First of all, it’s important to understand that you absolutely don’t need to start with gaming offers.
That is a good vertical, but surveys and freebies are also great for starting the first campaigns. And those niches tend to have more offers available.
The second thing is that, even though SOI offers are usually very simple to promote, that’s not your only alternative.
I recommend that you avoid offers that require a payment for the conversion to occur. But as long as the offers are free for the end-user, you can promote them. SOI tends to be a little bir easier than DOI, but DOI is certainly a viable and good option, too.
Regarding the condition for applying for offers, not all of the offers will require that… if it were the case, how would you get your first payment anyway? 🙂
Some offers are more strict when it comes to approvals, others are very easy and others are public and don’t even require approval.
If you’re interested in promoting an offer, I suggest that you apply and tell them how you’ll be promoting it. You’ll see that many will approve you.
About the link, you can choose the traffic source that best fits what you’ll be using. When in doubt, contextual can be a good choice. This doesn’t affect your promo in any way,it’s just for the CPA network’s own organization.
For the creative, you can choose text link or plain link. Again, just use the affiliate link and none of the rest of the code some of those options may provide and you won’t have problems.