i am 13 as well, so i hope i have a good idea on the budget restraints.
My first radio was a futaba 6x. it is a computer radio designed to fit really tight budgets. it was given to me as a gift for christmas when i was 10 (back when the financial situation was a bit better). it was fine for my trainer and my second plane, but then i got into aerobatic planes and ran out of programable mixers and was short on switches and much constrained due to the lack of switch assignability. i sold it and bought a used futaba 8u. it is like the 6x but has switch assignability (meaning you can program what switches activate what and in what position, up down or in some cases, neautral,) I was very happy i bought it. iut cost me about $200 a new 6x with reciever system and all that junk and stuff is about $200, about the same price i bought the used 8u for. there are no mechanical parts, so the new ones are jsut as good as the used ones. if you already have a reciever system, you can just buy the radio. there are very few pros and cons. you won't find computer radios with less channels than 6 usually. maybe 5, but i have not seen any. computer radios are a bit more expensive, but save you money in the long run incase you get a plane that would have required you purchasing a new radio to opperate. if i were you i would just do what i did and get the 6x first and when i decided i liked the hobby and would persue it, i sold it and bought a used 8u for about the same amount of omney as i sold my radio for. HOWEVER. there are compatibility issues between manufacturers. futaba and hitec are what is called negative shift. that means that the signal goes tward the negative side when imput is given. so that means that hitec or futaba radios can only be used with hitec or futaba recievers. jr and airtronics are positive shift, meaning that the signal goes tward the positive side, and can only work between themselves. so, if you don't have any radio equipment yet, i might be able to help you there. you probably want at least a 6 channel tx so that you can have a spare channel or two for use with your next plane. you also probably want a computer radio because they perform wonders. they are not difficult to program either. there is no computer code. just menues and options. they are strikingly easy to program. it is almost like filling out a form where you check either yes or no and go on to the subquestions. futaba is a more expensive company than most, but they have great range and great sesolution. i stick with them because sometimes going cheaper ends up getting more expensive and in odd ways. hitec is the cheapest of all of them i think.
about the starter, while stick starters are much cheaper (in some cases free if you happen to have a spare piece of wood) electric starters are much better. when breaking in a new engine, they are much easier. think of the electric starter in your car. you just turn the key and it starts. with a stick it is like trying to start it by hand. it xoesn't move fast enough to draw fuel efficiently, and you have to keep flicking it until conditions are perfect, and you also have to play around with a throttle. with an electric start, just keep holding the switch and the engine will start on it's own, at any throttle, usually in just seconds once it is broken in. some engines are tight when they are new, and some engines are jsut obstenant and stubborn because of things like cold weather. the electric starter kind of forces it to without damaging anything.