I've thought of some tips for you :)
First, the most important one, the "i". It's never, never "eye" in French. Always like in "fee", but shorter.
1) In French, there's only one way to prononce a "a": "ah" like car, but shorter. It's never aw, ay, uh...
2) Same for the "e". It's always like in pet, men, let... Never "ee", "uh"...
3) As for "o", it's like "boring", but shorter. Never "ow", "oe"...
4) "ti"+ vowel will often be "si" (like "sick"), but there are exceptions where it will stay "ti" (like "tip").
5)
Lea, for example, will never be "lee". It's always leh-ah (see before).
I hope it helps!
Claire