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Hi Xallow,
with program like Chameleon Submitter, you are actually getting the full database(DB) of TGP/MGP with all the niches that exist practically. The DB is being updated on a daily basis, the new sites are being added, and the non existing or not working sites are being cleared out. This is a good place for the start-off as you dont have to spend time looking for those sites and can rather focus on gallery building. Of course, later you can get into building your own custom DB out of the one that comes with Chameleon Submitter, depending on your personal needs and experience - this is what many experienced webmasters do to raise the profits..
The autosubmitter is a good way to post your gallerries to TGP sites, as for example with Chameleon you are following all the TGP/MGP site rules and the tool will not allow you to submit the wrong gallery to the wrong TGP site. Also you should not forget about Partner Accounts that are playing an important role these days.. It might look difficult, but once you get into that thing you will get used to the processes and learn many things and tricks on the way.

Good luck