Welcome and as you can see you have lot's of friends already.
Mine was floor of mouth as well... nearly 3 years ago and doing OK.
Ask as many questions as you like and they will be answered by very experienced people here.
Keep us up to date and try to take the advise from David R..don't panic

History Leukoplakia bx 8/2006 SCC floor mouth T3N0M0- Verrucous Carcinoma.
14 hour 0p SCC-Right ND/excision/marginal mandibulectomy 9/2006, 4 teeth removed, flap from wrist, trach-ng 6 days- no chemo/rad.
6 ops and debulking (flap/tongue join) + bx's 2006-2012.
bx Jan 2012 Hyperkeratosis-Epithelial Dysplasia
24cm GIST tumour removed 8/2013. Indefinite Oral Chemo.

1/31/16 passed away peacefully surrounded by family