There are direct buses from both Kunming and Dali to Baoshan. From Baoshan you can reach Mangkuan (芒宽) or Liuku (六库). Tell the driver in advance that you want to get off at the road that leads up to Baihualing.
You can expect to spend more than 100 yuan to charter a minivan up to Baihualing or alternatively spend three or more hours walking. Return buses from Tengchong are frequent, though buses to Tengchong from the end of the trail in Jiangju are much less-so.
Farmhouse-style inns are plentiful in Baihualing and run 60-80 yuan per room. The village has a handful of small shops, though it would make more sense to stock up on provisions in Baoshan.
There are places to camp outside the village. Although the only logical point along the trail for camping is near the small dwelling at the pass, which is conveniently located nearby a small spring.
As for arranging the hiking permit, you should contact Xiao Lin (小林) at 13987053498 on the Baoshan side or call 15287564229 on the Tengchong side for specifics. The permit itself can be obtained in either Baoshan City or in Qushi (曲石乡) free of charge.
You will only receive emails that you permitted upon submission and your email address will never be shared with any third parties without your express permission.