You don’t want a cruiser type. Maybe converting to flat bars from drop (racing) bars, but you want something that you can soup up a bit overtime.
1. Clearance for wider tires. 700c rims are light but many can support 32mm tires or more.
2. Touring frame/sport frame. You want those tires above to clear, and perhaps fit fenders in.
3. Eyelets on rear dropouts rose install racks.They are threaded loops where the back wheel axle is.
4. If you are good with drop bars, you can upgrade to brifters later.
Look for a moderately priced bike with good frame bones and it can grow with you!
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1987 Crest Cannondale, 1987 Basso Gap, 1992 Rossin Performance EL, 1990ish Van Tuyl, 1985 Trek 670, 1982 AD SLE, 2003 Pinarello Surprise, 1990ish MBK Atlantique, 1987 Peugeot Competition, 1987 Nishiki Tri-A, 1981 Faggin, 1996 Cannondale M500, 1984 Mercian, 1982 AD SuperLeicht, 1985 Massi (model unknown), 1988 Daccordi Griffe , 1989 Fauxsin MTB, 1981 Ciocc Mockba, 1992 Bianchi Giro, 1977 Colnago Super