Where do I ask for/where do I find play testers?

I'd suggest putting your game on Tabletopia or Tabletop Simulator and see if you can get people to play your game on there. Offer to play it with anyone and everyone who is willing to take the time to playtest it with you.

Another idea is to find a board game group in your area, and after experiencing a few game nights bring your own game to be tested with those interested in playing.

Please don't do like some other designers that just "went ahead and hoped that the best would occur"...!

Kickstarting a game is a very complex process. And having "Game Rules" is just the beginning. Although Game Rules have a "recommended" format, you could start by introducing your game in a Blog or Forum thread (don't send us the rules just yet)... And see what fellow designers think about your game.

NEXT I HIGHLY recommend "The Game Crafter's" "Sanity Test". It costs $30 USD and the reviewer of your rulebook will be critical and help you organize your rulebook to the best possible format. It may well take 2 or 3 tries to get a score of 70%+... This is an acceptable score. So expect to spend $60 - $90 USD for that service.

http://help.thegamecrafter.com/article/145-sanity-tests

Once you go through the "Sanity Test" - NEXT I would provide a link to your revised rules. Since someone has taken the time to PROFESSIONALLY review them. They should be in GOOD ORDER for designers to read through them.

It's fair to ask Designers to REVIEW a GOOD rulebook. Not to have everyone proof-read your rules format and not be in a coherent format (for example)...

When you get a review of your "sanitized" rules... Then the designers can make sure there are no remaining errors or issues with your rules.

The point I am trying to make is that EVERYONE should use "TGC"'s "Sanity Test". The service is invaluable and I've done it for my game... And although it was frustrating making changes to conform... Those changes were/are NECESSARY to getting my rulebook in better order.

Next step is: "Have you done blind playtesting?" I can offer you two (2) services for this. When you get your report from either/or... You'll know if the game is ready "FOR REVIEWERS". That's right, don't wait until "last minute" to get a review. Pick-out who you want to get your game reviewed and contact them... You can ask for a "review" of your pre-Kickstarter version of the game.

Once you have gone through the reviewers, you should have some good things to put on your page about your game... Remember reviewers are BUSY people too. It could take 1-2 months of waiting for a review. That's why you need to PLAN ahead and make sure you give yourself enough time.

If you get positive reviews... You can decide NOW if you want to Kickstart ALONE (not recommended - but it is an option) or find a smaller Publisher who will work with you towards doing the Kickstarter together. They should bring to the table 1,000+ backers from previous campaigns - don't settle for less... Otherwise your game will get a very poor performance on Kickstarter. Nowadays it's getting HARDER and harder to make it on KS unless you are a studio or producing miniatures or have a bank of e-mails to contact for a NEW game.

From that point - you should be in good shape ... understand what you should and shouldn't do...

But this has just been my experience, your mileage may vary.

Best of luck(!?) with your game.