No bid suggested means almost no one (or nearly no one) is searching that exact KW. Id suggest using phrase match instead of exact match if that is the case. The only exception is if you plan to drive outside traffic to that keyword in the near future.

Also if no one is competing for the KW, because no traffic, you can probably use fairly low bids anyway. Depends on category price for sure, but if category is under 30 dollars, you probably can bid .35 or .40 and catch what little traffic comes through it. May need to edge up to .50 though if other people's broad/phrase matches might compete for it. On the other hand, if product is $50 plus, and there are closely related KWs, its possible a bid of $1.50+ would be needed. These are just general rules of thumb, every category and price point is different, all you can do is test and see the results.

Last thought. Why are you trying to market a product to where there is very little search? Marketing a product is a lot like a funnel. You need to have an audience of interested buyers, which is indicated by search demand. And even when they are interested in your product, it is not often easy to convert them to a sale. Anyway, just my 2 cents. Hope this is seen as constructive!