Weight if not a problem with carry-on if travelling in F with THAI. The overhead space is small, but crew will stow your bag in another area if it won't fit.
1A/K are fine seats, but you are isolated from all that is around you. Some prefer this, some not.
Google the seat maps, the are actually 2 configurations; one wth 10 F seats in an open plan area, and another with 9 F seats each in semi-enclosed areas.
Don't be startled when the nose-gear retracts and make a sudden loud noise soon after take-off.....it is a "rite of passage" ...