Things you must not forget:

Always make clean versions (without recips) of your galleries (there are always new TGPs being created).

Check the TGPs that are accepting more than one submission per day (list them separated), and also check the ones that are accepting partners.

Don't be afraid to get in touch (always get in touch with you sponsors and to the TGP owners, they will always be happy to help you!).

Your sponsors will be much happier with you if you are generating sales (I think that you will be much happier too).

Learn from your mistakes (if you have made a gallery and it is not converting try to see why it is not working), change the sponsors, change the type ads you are using, try another niche.