According to your travel plan, you don't need a visa to Hong Kong(https://www.travelchinaguide.com/embassy/visa/hongkong.htm) because Filipinos are exempt from a visa to Hong Kong for up to 14 days, but you need a single-entry tourist visa to China (Shenzhen, Guilin) with 45 days stay duration. It is hard to get a multiple or double entry visa if it is the first time for you to apply for China visa. Normally the duration of stay of a Tourist visa is 30 days, which means the holder of the visa may stay in China for up to 30 days from the date of entry. If your estimated stay in China is longer than 30 days, please make it clear in the application form and ask for the Visa Officer's approval when you submit your application..

When you get tourist visa, you can go to Hong Kong and cross the border from there to enter Mainland China, you can have a roundtrip ticket from Manila to Hong Kong, Hong Kong-Manila if you don't want to go to Shenzhen directly from Manila.

where can i get the applications form for tourist visa?

Ms.anchie cruz, the application form A can be found on the top of this page. You can print it out and fill by hand.