Upvote:6
If you want to go on a tourist visa, make sure you have enough money to fund the trip, arrange the accommodation, and return flights. You must have a stable source of income and you'll have to provide a copy of 3 or 6 months bank statement. Once you feel you are ready, just apply for a visa.
You do not require an invitation letter.
If you have a close relative who is eager to fund your trip, request them for an invitation letter. You can't go around the internet asking strangers for an invitation letter.
Check This to know what documents you would require.
Learn more about French visa requirements for your country.
VFS Global is a third party that processes visa for several schengen countries including france.