What's the difference between this two pronunciations?

Again, that Ph word is only valid as a proper noun (a name) and names of people and places are as the owner of the name pronounces it. English isn't a random string of letters. Many words root in other languages.

Worcester  pronounced woo-ster or wistah as a city in Massachusetts.

Fill, pill, will, bill, sill, dill, will

I referenced it as Phil pronounced fill, because a strange name as shown would become a likely choice. If someone introduced themselves with that name, a natural response is "Can I call you Phil?" from Philip.

feel, wheel, peel, reel, real, deal, heal, meal, seal, eel

letter E pronunciation. 

It is difficult enough working with actual words. That is one of the difficulties of English. Since words derived from many languages, they have variations in pronunciation. Do not attempt to make up words that do not exist and try for pronunciations. Spanish is known for consistent pronunciations.

ph = f in words starting with ph.

I can also reference that when English is taught in Brazil, they spend excessive time on rules of language and working with printed language. They get very frustrated when trying to change to spoken English. It is common in Brazil to be able to read English and have great difficulty speaking it.

Fill is pronounced the same as ill with an f in front of it. Feel is pronounced the same as eel with an f in front of it.

Most online dictionaries have a feature which pronounces the word for you. I suggest using one of them, because there is no way to explain the differences if you don't know English pronunciation. The word 'feeling' has both sounds.