You can operate from hand written notes or 3 x 5 cards for up to about fifty seed types. Over fifty types of seed require computer assisted lists or all will be chaos. My seed inventory and seed start scheduling database is indispensable in my germination room. A copy of this database is available at my download page . Germination requirements for over 700 seed types are included along with sowing dates, transplanting instructions, and culture notes.
Some seedsmen provide excellent and complete germination data on the seed packets.
Some are notorious for little or no information. Some don't even identify annuals and perennials. Others won't even give you the botanical name of the plant. Be smart, don't buy seed from companies that fail to give you the whole story. More starter information is available in some seed catalogs than on the seed packets from the same company.