Stocking Plan for 55 gallon community tank

Hi Everyone! Long time forum browser, new member. Anyway, I'm starting a new 55 gallon freshwater tank and I'd like some advice regarding stocking density. The tank will be a standard 55 gallon tank. It will be filtered by an eheim 2217 canister filter. Modest lighting as it will only be a community tank with fake plants, ornaments etc. The species I plan on stocking are as follows:

Pearl Gourami
Gold Barb
Neon Tetra
Platy
Emperor Tetra or Harlequin Rasbora. (both if space permits)

My tap water parameters are gh 8, ph 7.1

What I'm mainly having a hard time calculating is the approximate number of each species I'll be able to keep in a tank this size. Thanks in advance for any help!

Thanks for the feedback guys. I don't believe I'll need any scavengers as this is not a planted tank and I'll be performing weekly gravel vacuums and water changes as well as feeding carefully enough to not worry about too much excess food escaping. Almost everywhere I've read about Pearl Gouramis states that they are best kept in harems of 1 male and 2 females. Thank you for the link to AqAdvisor. It is an excellent tool. This is the proposed stocking for this tank.

3 x Pearl Gourami (1 male 2 females)
6 x Gold Barb (a shoaling species so no need for a large school)
15 x Harlequin Rasbora
15 x Neon Tetra

Let me know what you think.

Thank you all for the advice. I had a look at AqAdvisor and it is a very helpful tool. I have taken all of your advice into consideration and this is my updated stockign list

1 Male Gourami (already owned)
6 Gold Barbs (shoaling species so no need for a large school)
12 Neon Tetras
12 Harlequin Rasboras
6 Peppered corydoras

What do you think

Thank you for the feedback, and sorry for the double post. I confused it taking so long to show up with it simply not working :/