Let's say i want to attract/meet/manifest a lover that have certain qualities and/or remind me of someone i know.
Which kind of focus tool is better this? Candle ? Talisman ? Bag/Bottle? Petition ?
Depending on your level of expertise, resources and patience, I would say go for anything from a full fledged Picatrix ritual or just the Chaos Magick sigil you've been told of.
Also, if you subscribe to any personal mythology or religion, the associated sacred texts and elementals can be very useful to invoke.
Surah Yusuf if you're a Muslim.
Kamadev mantras if you're a Hindu.
I would like to add to Johny111's recommendation with the sigil he described, however...
Sigils are representations of living desires (elementals).
If you create one (give it "flesh") at a particular time and place. You absolutely must ensure that you know what the astrological placement for that sigil is.
E.g: If the ascendant is Leo (a fire element), you must burn it.
If it is pisces, you must return it to whence it came, i.e, water.
DO NOT UNDER ANY CIRCUMSTANCES BURN A WATER ELEMENTAL'S SIGIL.
Then again, this is just what Israel Regardie would have told you about talismans.
You have limitless methods.ss
Do what you will and good luck.