So basically you sign a contract in blood (I think) of the animal you want or an animal that chooses you and once the contract has been sign you have access to whatever animals are on that contract. You summon them by doing a set of seal (after drawing blood) and pressing your blood on a surface (even tho Sasuke randomly did this in the air somehow) you exert your chakra on said surface creating what would probably be considered a seal and then whatever animal appears. Depending on how skilled you are you may or may not get the animal you want from your contract. I believe Naruto has summoned the wrong toad several times but don’t quote me on that.
You don't need to place your hand on a surface for a summon. But yes you make a blood contract, sign it in blood. It's a unique form of space/time in that sense.
And yeah early naruto was a dumbass.
Same as our other training, I post the stuff, give me a run down, ask any questions:
(Kuchiyose no Jutsu: Kyodaibachi) Summoning Technique: Giant Bee
Type: Supplementary
Rank: B-Rank
Range: Short
Chakra: 20
Damage: N/A
Description: The Giant Bee (巨大蜂, Kyodaibachi) is a giant-sized bee which was summoned by Suzumebachi. Its anatomy slightly differs from normal bees by having a jaw of razor sharp teeth, a deadly stinger, and wings capable of pushing back enemies within short range (C-Rank ability), which makes this insect is a difficult opponent. It can also spit massive amount of honey from its mouth to trap and ensnare its victims. Its honey attack is B-Rank and has a Long range reach. It can take C-Rank techniques and remain undamaged. Its main advantage is that it can fly with up to 3 people on its back.
Note: Only summonable once per battle.
Note: All its abilities count as moves