How will going into ROTC, after signing an SMP contract, impact my attending basic and reporting to my assigned unit?

(Join to see), the regulation that covers the SMP is AR 601-210, para 9-14. Cadet Command's regulation that 'sort of' pull all the applicable stuff into one spot is CC Reg 145-11 (all the Cadet Command forms/regs/etc. are at https://www.cadetcommand.army.mil/forms_pubs.aspx). The ARNG's reg is NGR 600-100 in which Chapter 13 addresses the SMP program.

Once you sign an SMP contract, you must enroll in ROTC (MS II, MS III or MS IV) within one year. If you are enrolled in ROTC, then BCT is not required (AR 601-210, para 9-14e(19)). What you will be required to do is attend ROTC Basic & LDAC (Leader Development and Assessment Course .. used to be called 'Advanced Camp'). In your case, you would enroll in the MS III class.

If you are a "Potential" participant in SMP (i.e., you signed the contract but didn't enroll in ROTC yet), then you're not a "cadet/officer-trainee" yet and get paid at your enlisted rank (likely E1/E2/E3 depending). Once you enroll in the ROTC advanced course, you will now become a cadet/officer-trainee and paid as an E5.

Remember - you sign an SMP contract with the component (USAR or ARNG) and 'complete the requirements' of it by enrolling in ROTC. Both sides have to complete the admin portion for you to become a 'SMP Cadet'.

Regarding your assigned unit - units are limited to the number of SMP cadets they can have. You'll work this out on the 'front side' when you are signing your SMP contract - you won't be able to do the contract with the reserve component side unless there is a unit that you will go to already identified.

For uniforms, SMP members are authorized a complete uniform issue by their RC unit. If you were in ROTC first and then later signed a SMP contract, then you would have gotten your issue through the ROTC detachment (CTA 50-900, 5a(5)(d))
----------------------------------------------------
* AR 601-210 - https://armypubs.army.mil/epubs/DR_pubs/DR_a/ARN6642-AR_601-210-001-WEB-1.pdf
* CCR 145-11 - https://www.utrgv.edu/rotc/_files/documents/cc-reg-145-11-smp.pdf
* NGR 600-100 - https://www.ngbpmc.ng.mil/Portals/27/Publications/NGR/NGR%20600-100_20221122.pdf?ver=dwcxyN-shPzZxt7P5N84PA%3D%3D
* CTA 50-900 - https://armypubs.army.mil/epubs/DR_pubs/DR_a/pdf/web/CTA%2050-900.pdf

First, I need to point out that Officer Candidates do not have rank. You are paid the equivalent of an E5. You are not an E5. There is a rank structure for cadets and candidates but there isn't a pay scale for them. I knew a Candidate that called hims a SGT and I honestly was shocked. I am glad he didn't finish his training and was separated from the Army. You need to talk to your School about this. You could do either. Going to basic would familiarize you with the Army but it necessarily wouldn't make you a better leader. I have heard of people doing what you are doing for their masters. They return to college for two years and they contract so they can commission. You can contract in your first year of college and skip basic. If you contract you will have to wait till your last few month of ROTC to get your branch assignment. Everything is dependant on that. The needs of the Army will change by the time you finish ROTC. In the last year of your ROTC time you will have to compete nationally with everyone else in ROTC for your branch. It is now talent based branching. That means if you want to be a pilot in the Army you will have some stiff competition. Most get their top three. You have to keep in mind, if the Army is struggling to maintain enough infantry officers in unit you and most of your buddies might find yourself at the Infantry BOLC at Fort Benning. Now when it comes to shipping to your Basic Officer Leaders Course there are a few factors. First, it is based on slots. If you commissioned into a branch that is back logged at their school you may wait 6 six months. Next, it also depends on your OML. If you branched infantry but you are at the end of your OML you will finish school with your commission and wait at home until the next spring till you start your BOLC. I was a commander at the Infantry School at Benning. It was very common to see classes full of ROTC in the fall and spring.


https://www.cadetcommand.army.mil/res/files/forms_policies/handbooks/Talent%20Based%20Branching%20Handbook.pdf

What exactly are you asking? I can't tell from your narrative.