Change the oil and coolant, and wait and see what breaks
There's a remote chance it might need a clutch, depending on how dumb the past drivers were. You'll find out. I have 200k on my clutch, so it's possible to be gentle to clutches. On the other hand, they are wearable parts, and a Kia transmission is not heavy at all, and changing a clutch is full day's job but doable by a shade tree mechanic.
This is quite a new car, and it has a manual tranny. Stupid MPG from that little engine, a real nice econobox. I'd take good care of it.
I want to put the car in reverse (manual) the shifter sometimes gets half way in and reverse doesn't engaged
Normal. Just come back to neutral and back to reverse again, it'll engage.
A lot of manual trannies have seemingly gimped up reverse; and I'm pretty sure that is intentional "gating" to prevent you from shifting into R quickly. To keep you from making a big mistake on a 5-4 downshift. Also, there used to be a technique of "rocking a car out" when it got stuck, of 1st until it couldn't go any further, then (very rapidly) R until it couldn't go any further, 1st, R, 1st, R, your freedom of motion increases with each move, and eventually you get free. This required very rapid switches between R and 1, and not over-gassing and spinning the wheels. Automakers hate it because if done wrong, it would break transmissions and cause warranty claims. So they've made it rather difficult in modern cars. Though electrics may reverse that; not only can they do it without damage, they can automate it :)